Malicious PDF — malware analysis report

Static analysis result for SHA-256 3555a1e87abd4f72…

MALICIOUS

PDF

81.7 KB Created: 2021-09-22 19:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 206645577390cd3a20c1352016b13bc3 SHA-1: b7f274af61091accda01b46b3a4a4176f209cd01 SHA-256: 3555a1e87abd4f7236a1b9be3795a3076776b991b08809e3f5910df2eefc56ef
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a variety of domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, with ClamAV identifying it as a phishing trojan. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://philabc.ru/uplcv?utm_term=iphone+13+price+in+bangladesh+2020
    • http://kadh.kr/bobod/upload/file/loboritimagoladofalosi.pdf
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/8913da6099e096c29188ef51b1dfb5f1/fevuvedez.pdf
    • http://upakuika.com/img/file/sadekaleji.pdf
    • http://tochalco.com/uploads/files/padorukupelap.pdf
    • https://oferta.lt/i/File/mudokinijuxejepigujejo.pdf
    • http://iweldbot.com/ckfinder/pho/files/lexibubedak.pdf
    • https://dejavuruse.com/userfiles/file/86003949910.pdf
    • http://ppfi-online.com/userfiles/file/jamepuzupidu.pdf
    • http://hyundaidongdo3s.com/images/files/33086631102.pdf
    • http://www.sandipmallick.com/fckimages/file/2222670569.pdf
    • http://smartpaintingplus.com/userfiles/files/samokegabebefumuwom.pdf
    • http://worldprint.su/userfiles/file/kakezevonizofigixipikarew.pdf
    • http://sinoscaform.com/upload/ckimg/files/202109092131341240.pdf
    • http://auksozvynas.lt/userfiles/file/poketuwafijagesexotuwe.pdf
    • http://bahtiyardishekimi.com/fckfiles/file/5362835263.pdf
    • https://trimix.bg/UserFiles/File/webivofuwiluwuw.pdf
    • http://energosol.pl/images_cms/file/pelaw.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161353bdfa6ff0---darijek.pdf
    • http://mp-journal.com/media/file/durepaxanajarumim.pdf
    • https://ijfbacknumber.com/editor_up/67356158560.pdf
    • http://szamosiszerviz.hu/feltoltott/files/20818172034.pdf
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210906_8E9BB66621953F14.pdf
    • http://maroba-zirndorf.de/file/83862608379.pdf
    • http://kooijobs.in/ckfinder/userfiles/files/gusokepikejimivasilu.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367b8c9fdaf---72066535815.pdf
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/safesimaxadag.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_off0000d9ce.bin
0599cd9990e03e820a3ded575cc2663d3d97c8b5d80e105c699ca35e6643f0cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CE 17472 bytes
font_01_sfnt_off0001073e.bin
fb8c77c65996a54db26ce0b826878bd5142e645d42317a607d60b571969d9c1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1073E 11252 bytes
font_02_sfnt_off0001212a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1212A 16792 bytes