Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe8f1e6b64b9e4f8…

MALICIOUS

PDF

74.4 KB Created: 2021-09-07 18:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 10b230b19da75beb90d357f65c4a542c SHA-1: 009c72a8ed789962be92396b75ad6e31641d44bc SHA-256: fe8f1e6b64b9e4f8897fe14e08cd6e95c7a16018639b1885653cb73665fdf174
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of links pointing to various domains, many of which appear to be disposable hosting or compromised CMS uploads. This suggests an attempt to distribute malicious content, likely other PDFs or executables, through a link farm. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://santchavarabed.in/ckfinder/userfiles/files/toketekalopeliji.pdf In PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/bawixokujozoxodapovuzami.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/noxajiketokovufinipegef.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/wepuxejo.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a573df40f32---32649327325.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/1e47edfd74d9e844ae4a06b2818b8247/nugopusag.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2180586a5---nubijopigawumarevimo.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f7a649bd0---woripigitixi.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/adf0c4fbf22166a29ca30ec740dc8d06/60189250323.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d8f7b401da---tebekiberazuduvararide.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/523f14f036601a3688cddee43625a9c9/vaguzozavedizinoje.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6eabbde9b---32198016853.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/61004788080.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/vlbnaa609ppihamdtt3tn3tqjb/33584173804.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b2bb80db5---nitip.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/93149029641.pdfIn PDF document text
    • https://juraganmonyet.com/contents//files/xitasososexulabolew.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/foketuvonepu.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/32632318088.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/91949608073.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/kinijusere.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/bddc310c2829d4a85f07f2db44b52207/daduvunakonopal.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/33194645453.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1612d2fb6a0177---45239149143.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/34408539776.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=stewart+calculus+8th+edition+solutions+manualPDF 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_off0000be35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE35 11104 bytes
SHA-256: 4285bc871e27165f6f2db1a3681731d520b4dec32a65e9e0d336f7827d16326c
font_01_sfnt_off0000d7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EF 16872 bytes
SHA-256: 56c6f1ce226669cb956921b9459acb346bdc24171ef7452eda42e0481f304705
font_02_sfnt_off00010393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10393 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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