Malicious PDF — malware analysis report

Static analysis result for SHA-256 4468d30d25b021c4…

MALICIOUS

PDF

78.8 KB Created: 2021-08-15 02:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f93f3bdec503164176ef670d3f40e4af SHA-1: d5a81176d404afe7b25a699354c737a801609363 SHA-256: 4468d30d25b021c4b2f21ca31dfcf3d975b34891cf888be3053546161f19d2f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution lure. The document's structure and embedded URLs are consistent with a spearphishing attachment used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://infrive.ru/uplcv?utm_term=marshall+mathers+lp+2+download+mp3 PDF link annotation
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/3ha549c8f71s62kbglm42sdp79/jakagug.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/mutoxuvoxewiladodotu.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bfa405fea---detij.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/mixosoninonikepata.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/23f23b0e49f4cfd651d9238d4c8a2346/71848081490.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/57050020352.pdfIn PDF document text
    • http://epicridesnepal.com/files/difejidoronedizuwagejan.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/93099110015.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/40946806739.pdfIn PDF document text
    • http://esen-life.com/userfiles/file/digefojuwaremije.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607930655008c---vidogadumilupufevuzufe.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5076a1a599---94936346815.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/sapixeteguvasudivit.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/lozadot.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/dowuxuxosi.pdfIn PDF document text
    • https://seerupit.dk/assens/file/zabagaxu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160af80bba73cc---84624741161.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/10094544220.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0c3270ad3---68752610513.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160824a51bca5e---kuriwojovelositogarezadu.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/aaf944feb6fa92a8c4d2d4a49aacc700/bejabozuwuku.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/vugukofamobiv.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/gabidafoja.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/42752766868.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_off0000cee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE4 16952 bytes
SHA-256: 35a9a041c99339dd9748b539f21fa0110d9d3b1e68de6df9999efb8572082ff5
font_01_sfnt_off0000fb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11325 10936 bytes
SHA-256: b06f7ac953e2247b90bbf474aa748e54749327c2616affad11fa8026f70d6bb0

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