Malicious PDF — malware analysis report

Static analysis result for SHA-256 929240fc85e34e69…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 00:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 05387f2811e497781b269f4d9f8d8cdb SHA-1: 32edd292cd41e55ecc7f1953fbd9bfaa8024fd32 SHA-256: 929240fc85e34e698afe7fe4fb59edcb4c5cc65f9926ac3267929bddac3d7a33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate the PDF contains a link farm pointing to various domains, some of which are hosted on compromised CMS upload storage. The embedded URLs suggest an attempt to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://tingchucontrol.com/Uploadfiles/files/31662181633.pdf In PDF document text
    • https://jss-moms.si/upload/File/nokelazikotodufimilik.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/10583448292.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/fuvusebefojotiva.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/99642176285.pdfIn PDF document text
    • http://submission.jpvm.kr/pds/userfiles/files/51472056114.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/wanekozivexogevejeke.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/gejanemebajepuwuf.pdfIn PDF document text
    • http://glassick.com/userfiles/file/botajakefolasugigunomin.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161357104238af---30206683742.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/kezodamuropi.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/85494723990.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614941c156598---loredoxuwupijerimilale.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16135b40194c32---pewosatarolakutu.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b674c3eca4---viwomefovabu.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109192111421996.pdfIn PDF document text
    • https://fratellifurloni.it/file/kotasubukuladi.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614e3eaf7f104---vilogum.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/25244062864.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/43949492545.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/furagefafodije.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109040759231835.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/vanutumebatesam.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/sipajelowe.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1614e4781dc2a6---85961010843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=hacksaw+ridge+gomoviesPDF link annotation
    • https://lapdonline.org/file/45005158733.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_off0000b08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB08F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A1 14736 bytes
SHA-256: 6553833f0d2e256253890b0c1d69160b7c36a6c30a419258e768cff4cfc3b2a9
font_02_sfnt_off0000edda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDA 10700 bytes
SHA-256: 2a33478310554dcafc5a43d38bb55e4088f79fa2944ddd197d2fd864b52bd7f9

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