Malicious PDF — malware analysis report

Static analysis result for SHA-256 3337b0e2db7e3222…

MALICIOUS

PDF

94.1 KB Created: 2021-07-31 20:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0d37001c5c2a8ac3f315f45c034dc0ef SHA-1: 29e122b79f14d88362dffc1d0eec221a27058bd3 SHA-256: 3337b0e2db7e32228f6374cfca8dcefb02337835a75a27eff9f08c9b2671a170
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://allytemp.ru/uplcv?utm_term=ruger+sr9+specifications PDF link annotation
    • http://heatherjansch.com/ckfinder/userfiles/files/timemokulimodo.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/vetetoziwenabutelivu.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-25/20210625190626363229.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/161002001e2f8a---vewedogex.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608db8812fead---sotofaw.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/buritani.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/49789051751.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed4108d7ee---jimutaziniwadofigud.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/pigegenonage.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c58fabad243---tuvok.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f02f84cdb8---96095130627.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608187ba2eb94---39677516681.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3f945b577---81360023594.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/rpd0pb4tqjldpqe06l42lo1jt4/memelaw.pdfIn PDF document text
    • http://samtekelektrik.com/files/77437851952.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160894ddf202cf---18611962662.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/2300106843.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/907565985.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/xajub.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/48074835752.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/14755764692.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/46763816052.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/1dbdrj7slh4cjq61eanivnu3jo/rajumabe.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_off00010a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A15 18108 bytes
SHA-256: 3bd65db61ae3619e8a0395c4c0350a8321781eb7a4563e7e9b13ecb5ad581b34
font_01_sfnt_off000139a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000151b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151B8 10920 bytes
SHA-256: 7afa422bcb034f83a16419823e1af0e44988a1e98aebebc03fc560ea43378924

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