Malicious PDF — malware analysis report

Static analysis result for SHA-256 9890ff2a16bf2897…

MALICIOUS

PDF

107.8 KB Created: 2021-08-10 14:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1213dad5787284efcceb1def3e006c6e SHA-1: 5b6eab0abbf0d31ac207e29ff0d4c77195621e45 SHA-256: 9890ff2a16bf2897cf8c5579320ccdf620f6beafdf7767f24e0f86faf6b4b4bc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm designed for phishing or malware distribution. The 'SE_CALLBACK_LURE' heuristic suggests a pretext for users to interact, likely leading to further compromise. ClamAV detection and ML classification confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • 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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://coretry.ru/uplcv?utm_term=example+of+hotel+staff+meeting+agenda PDF link annotation
    • https://habibitours.net/ckfinder/userfiles/files/renirup.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/3bc4fbbb3b24c3d2a2c5cb74568dbdc9/86048245868.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/luweximamo.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/d260cd18338513081de7703f90489dd5/91516501522.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/fovoja.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/zejaruv.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/e0c0bb40bd0d4fd0d29999eb1c0ceb78/jabaxozuxolufuwu.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/718100582081620681821.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/43815124171.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/zejudo.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dc6948c68---51511667563.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/4af4a7b82cebed158c3f14aa9114683a/69145092112.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/15887840016.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/62255342080.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/79dfa093270e81e1cca4caa076ad4d9d/jizijo.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/9e49b7490113e4fd1f8ec396d24453c6/bagepobekikide.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/365fba84ee44aae2f7d32a8cd2981dc3/ritojasi.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/92525391145.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bce1221d968---5928265074.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/8308702429.pdfIn PDF document text
    • http://digifast.cz/userfiles/zopejejosumemari.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/kisejumukiluzol.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/r9phmllfgcipaf2i1gsi0ust82/42599523986.pdfIn PDF document text
    • 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_off00013db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB2 18180 bytes
SHA-256: fb348116439c2eeee690817f9e065d8d6d5a8e6047b2893365d4ea95f8f3ea46
font_01_sfnt_off00016df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001860b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1860B 10932 bytes
SHA-256: 3a4a1ecc02b7678250bf535a82b5e5d2d54f52e9a8e6a0df36e73ba7aac64729

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