Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b4d4fa3abe104e…

MALICIOUS

PDF

77.3 KB Created: 2021-09-01 01:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ee147d29b99f17bf46f7b52a0b8bcdc SHA-1: 3cb4a4bab3fb0036dc9433dba4186c21f5238202 SHA-256: 10b4d4fa3abe104ef7d3e9fd9acb50586f6ae0e779ecebdf6d15f71645945ffe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites. The primary purpose appears to be redirecting users to potentially malicious content or phishing sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. No scripts were extracted, but the presence of numerous external links suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/7iu5tfo5qb4mlgr7dvgk8g2so1/30634701497.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/279ee6f82b1866b43b23434297cdc7db/tutazisaporeropa.pdf
    • http://guoyangmoju.com/userfiles/files/39669350726.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dc35eecf6a3e7d8cb1263fb367945bb9/gapoxemugu.pdf
    • http://danies.ru/ckfinder/userfiles/files/zasofokez.pdf
    • http://goldendazzle.com/upload/quangtri/files/94697685260.pdf
    • https://hosvagyok.hu/userfiles/file/47608303636.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0b1deb599---kidumimononi.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/e86321b5e963b7a0090f5995a0a3a1aa/ganebuw.pdf
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/sagojixidetevipubujubuzev.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8c52d2ed9---xajunadib.pdf
    • https://rhodium.vn/uploads/news_file/negazovo.pdf
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/46176241380.pdf
    • http://perchegouet.com/ckfinder/userfiles/files/pujulijoxizibifakepodi.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160830abd855df---dadirojoti.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1a0ddd379---nepasinajaliwuxelopatoben.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/8f18b46a211e8e65d3117729b904150b/mivutakus.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/4e6h7cajj96jroub1mde9eqbcn/61187974391.pdf
    • http://sangiorgioautoservizi.com/userfiles/files/83008061768.pdf
    • http://nfc.soo.jp/file/9912921927.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=lords+mobile+cracked+apk
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/7cca99763b5ca4f8a23049327c7a6cbf/wofajetusijelowakak.pdf
    • 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_off0000c9ea.bin
b59cd138f7950f7f16436180d1b83d7eddc33e0b262acc7d92062178e3c76ed2
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EA 18116 bytes
font_01_sfnt_off0000f83f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF83F 16792 bytes
font_02_sfnt_off00011056.bin
69dfbfaeef5e8f034f7523b06de4bb3833d8a3a194028a02f641fc7b17d50f88
pdf-font-stream PDF embedded font (sfnt) at offset 0x11056 10664 bytes