Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c84372b9b4da7f…

MALICIOUS

PDF

100.8 KB Created: 2021-08-22 00:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 14bbd27cd16130ff32f705ca8b0f8e58 SHA-1: 7bf015c7a6208866c050ef9f65bcfda40071cf21 SHA-256: e7c84372b9b4da7fccd14d96fc5c3740a8d141cebf5e4df7d45ecd31da5e6afd
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded JavaScript stream and a large number of links, many pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The primary malicious URLs are hosted on compromised WordPress sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/e4ogs6j403degpgtta934uc1u3/fobojepa.pdf In PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/5c820a6807380873ed8d3fdd47d52ecf/bonele.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bd990ba4989---sozakilareribogejugabofo.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/10993121767.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/bajepabef.pdfIn PDF document text
    • http://iphysiology.ru/upload/20748057410.pdfIn PDF document text
    • https://dm288.com/slicice/file/wunamotesodalitimozeje.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa5bed7abe---74316871780.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087a94e613d1---ravapazonekewonarin.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/12440155359.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/38635270088.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/5847d3692344ecd771a07122b021a5ee/mabagelujowuwalukikizaga.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/9546826956100214ca758f.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/23d314e4aa6b7d76f62dc4ed354f55c2/42728621327.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da5f67f168---3791250221.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/95790942926.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/nuxagababujininelo.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/17839ad55aff78f94adaca6bc1323fb8/964455086.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9362198a3---26144695467.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/10231284333.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/cf5c04d9db867656c892490dbc9aae1e/58792047800.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/vjfbnqrqf18t62t704tkvq4k57/gibijoxesavamagir.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073aed1ebaef---neralejif.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cfebeebdb---5166086611.pdfIn PDF document text
    • http://ohstigers66.com/clients/d/da/da15611725e7ba20b6827cbf2e24f87d/File/nurimepupu.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a439e5a5d0---92733979071.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/pelavuxisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=ejercicios+resueltos+de+teor%C3%ADa+de+colas+con+dos+servidoresPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000136e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E1 10704 bytes
SHA-256: 36bfaa7d14ee629dca051992075d2f70e262e5005643ad9519aee8e98bfadc4f
font_02_sfnt_off00014f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F81 19496 bytes
SHA-256: 8a45307b05528b90ca0b342ad5215cd3a600d8477635cfe17223da65d0d50394

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