Malicious PDF — malware analysis report

Static analysis result for SHA-256 8079d3dc08d89671…

MALICIOUS

PDF

75.1 KB Created: 2021-10-08 06:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8f38156bd6fcede3a3177000a9c6c5be SHA-1: 8143ea402f09ffed4afc42332915a4b771b64458 SHA-256: 8079d3dc08d896718ac5fac3c8cf01717e0c283c7345d8df3edb122820fee304
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links to external websites, many hosted on compromised CMS upload directories or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://catamma.ru/uplcv?utm_term=the+hard+road+to+renewal PDF link annotation
    • http://greenglobepms.com/uploads/daxatojojisabububajo.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109041553548918.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/bipata.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/1137640258.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/nupogejinakavowadefijaf.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/98534899222.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161541c9d37b29---dimevibewomisib.pdfIn PDF document text
    • http://jainfarms.com/uploads/63080183460.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/97947492760.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/80426646835.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/kuvoki.pdfIn PDF document text
    • http://trevorhannant.com/lafoburuzuvapizusu.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/zerugexudodewezabofevolet.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/deramovobex.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/93842116000.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/26845226245.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/zaxikadew.pdfIn PDF document text
    • https://quizai.com/uploads/files/vosivokodagowu.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/65893960289.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/numul.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1615ddfb48971b---pejufenifirawotidasozoget.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/sezugimikasafu.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c3b0adea2---37462593476.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/65199827093.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/rikagitedozozuvujasenur.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_off0000c011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC011 10132 bytes
SHA-256: 66c92f4a9b7bbf3f703963eb17fefed4b6d43059d3b6dbf28f087e542acb847e
font_01_sfnt_off0000d6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC0 18720 bytes
SHA-256: 3d585c01ec0842dc000c12bb008553cf59824e7293cb9779ac793a2a98c9cea6

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