Malicious PDF — malware analysis report

Static analysis result for SHA-256 62f981a059b8160c…

MALICIOUS

PDF

84.3 KB Created: 2021-09-07 17:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ec9731a3e131abc64d9e3d4b5ae8faf4 SHA-1: b0d2bbcb34066ed885a2416b11b291d0cb9a219d SHA-256: 62f981a059b8160c912549f8dd4bdcbfb4ba96ae1481b6009db2cf6d0d6abee8
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external URLs, many of which point to compromised CMS upload directories or disposable hosting. The presence of embedded JavaScript and the nature of the URLs suggest an attempt to download and execute a second-stage payload, consistent with phishing or malware distribution tactics. ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://hotellemaritime.com/hotel/upload/files/25466610769.pdf In PDF document text
    • http://etre-belle.su/images/file/newubo.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/lhgjlh291213tj8bfmbppup457/kanomobatewazoj.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/farenajufaxulos.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161210fcc87314---vefiweverikekinag.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/41c1c8645094a65b6c62e7bf5cb3043a/jijidekoxefatekujen.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/lewixatiwamesezol.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4de0cc2b5---54294493031.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781ef1a6073---91441051262.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/pekaviboboximufovigofu.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160799dd522c03---vatalogozupudatisabu.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/3370702600.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/76870505447.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/98b6ebbc60e28d54ef073c8f89518554/kovewufipevila.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/16436654992.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/ea7c3bbaf1f42f0043e45fe7aab16fbd/82634900715.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/5d3d7779d452bf67d6f0855c2b3f0e5e/sixavaxozajivivenobewoje.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606feb8f174af---77417578474.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/surejotigi.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16117d1612b897---nilonedamelexularakezuwa.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/jg7duja0tt2b98f4ingr2haegh/48056862521.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/79359387144.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/86215658519.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/3dkev7dm698kcvoa45580d3fmq/peluw.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/vegin.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/3vg4hh4e4pn2thmcn0o8mp9m05/mizekubakaxurefuwera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=formulario+i-90+en+espa%C3%B1ol+pdfPDF 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_off0000dce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE2 11168 bytes
SHA-256: 39eb12c8f2f850211a6d91b288ca6b11f9d0af05d83dc953463ed3060b8b02b4
font_01_sfnt_off0000f6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AE 20000 bytes
SHA-256: 1c6b7b66d6ec1458fcf18682a1accc56f3cb46156c17c94d6349dbe0e4077ed9
font_02_sfnt_off0001294d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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