Malicious PDF — malware analysis report

Static analysis result for SHA-256 37c9f7485307c5f2…

MALICIOUS

PDF

79.1 KB Created: 2021-09-15 12:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d98fe9cc10d8499b98533b7668cd0b1 SHA-1: 55b107834a98f023f0fa2d7d5c7a7d8b9ad63fb4 SHA-256: 37c9f7485307c5f2f1b1f7e942e36a95f15c63ac03a63624676724a51caab7d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://chineseclothingonline.com/File/bimonavix.pdf
    • https://baoyi-chuck.com/ckfinder/userfiles/files/46260113460.pdf
    • http://paulgraphics.paulsfashion.in/files/10880772039.pdf
    • http://amsuatrust.org/survey/userfiles/files/74983703168.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/cdl7eh691ifo5s7g7lv5i3nvbq/jugeragafasevivoxidatut.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/542c96ad02cc4173fe7d11621e6225a7/werojafedosibe.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/oa426c5bm1rf7g9mulunm34707/47618071770.pdf
    • http://airfa.it/userfiles/file/17408078697.pdf
    • https://infotechb2blite.com/bot/ckfinder/uf/files/wojuxisevadufepidede.pdf
    • http://ap116.ru/userfiles/file/59624897273.pdf
    • http://tfforming.ru/d/files/52417266509.pdf
    • http://coeb.eu/userfiles/files/ximozupemixenivevape.pdf
    • https://avigailpekelman.com/sites/default/files/file/bedosere.pdf
    • http://xn--m1age8bh.xn--p1ai/files/file/gejudoxunop.pdf
    • https://k31szmq42-nu28.com/contents/files/60478489589.pdf
    • http://scoutpate.com/userfiles/file/bupodafifipikepuxi.pdf
    • http://hockjoohin.com/admin/uploads/file/wafosijisotelezibo.pdf
    • http://dream-mebel.com/pic/file/7469354609.pdf
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/dejajibigunilokoloma.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613167313a603---56652090186.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612efc4cbfe66---89601844059.pdf
    • http://p-itos.net/admin/userfile/image/file/zadoku.pdf
    • https://nocnepal.org.np/ckfinder/userfiles/files/jawitijomotazuvonobi.pdf
    • http://tottazo.com/userfiles/file/kuwanufaberaf.pdf
    • http://korytnica.net/data/files/96394138060.pdf
    • http://vietsaovang.com/uploads/userfiles/file/21905299870.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=grand+theft+auto+3+cars
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d17f.bin
b875b5c0ddabb648cf1434d34b98a0241c8f8f55627545b923f7d70702067514
pdf-font-stream PDF embedded font (sfnt) at offset 0xD17F 10748 bytes
font_01_sfnt_off0000ea3a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3A 16792 bytes
font_02_sfnt_off0001024c.bin
1880814821349495bff380a016a174b07df4eb8ca3e36a38596daf813d5dd4a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1024C 17160 bytes