Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a251ed789e86931…

MALICIOUS

PDF

80.8 KB Created: 2021-09-02 06:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cd7d282e9af2acd8674a6a5d5afbbcb8 SHA-1: 08fc8a62e5f17c34e466c5d6bee85616fa3c342d SHA-256: 4a251ed789e86931c32b6fa77eb1385ad15ce077a2f5bb38971b2564eec0915b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the non-clustered link farm structure on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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 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.
  • 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://jinanxintiandi.com/userfiles/files/42759707244.pdf In PDF document text
    • http://fantalife.nl/userfiles/file/64708967876.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/wexeze.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/ledesoxulujigoki.pdfIn PDF document text
    • http://qachs88.com/clients/58271/File/sixejugateguzidemikisolu.pdfIn PDF document text
    • http://deborahbrown.us/clients/860103/File/98050317023.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/gezov.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/07832d15fb13d21979fc09c3db8532b8/3633966349.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/edd8be1dfa4742ac7d178fcb6e0e5efa/28192380273.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160952929d01bb---80051472459.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/37403924644.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/14603333389.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610c316f9eede---79094967618.pdfIn PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/dalerutivuwavalojasi.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/2tvjsvdcbt4s5vco2hmjp6v2g2/77343026848.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210613063530.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/51dd0e5da0bfc4b7b7263a89e5f188c8/depevuwafesuxi.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/6f90af148da819db27e0953ff418b851/13877088406.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/40706701363.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/67091912593.pdfIn PDF document text
    • http://ellev.fr/upload/files/78596428044.pdfIn PDF document text
    • https://chp-travel.ir/data/file/6010659678.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/18485929422.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/98288f8100c9a09bf7e4bc05974b449b/virowowovolekajen.pdfIn PDF document text
    • https://huanghecables.com/d/files/xavovevutafefu.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4389447b31---furoxora.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/631895af120aa8e21b335f926d1e7ea8/83587474086.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=doubling+and+halving+worksheets+year+5PDF 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_off0000d5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AF 17544 bytes
SHA-256: 7e7a5edb17767da6f8aaf6a2f0fea767718dc2499d3d64b23e26cd70714a9a0e
font_01_sfnt_off00010327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10327 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3E 11260 bytes
SHA-256: 2a8658741d057907807c6a61562ad5e11c78b37271b12f67a1f47e1c7f0de9e0

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