Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dced75164a3bcb0…

MALICIOUS

PDF

85.8 KB Created: 2021-08-10 03:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 31bb1faef3a19d748b1b1d5b690c50b6 SHA-1: 4693173e901b38912c5126bf4329044c7fdbf1ca SHA-256: 8dced75164a3bcb00abd4857de3bbacf762a57c6d286b8e2a580a2c4f8d8dd76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to numerous external URLs, many hosted on compromised CMS platforms or disposable domains. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://archism.ru/uplcv?utm_term=snipers+hide+rifles+for+sale PDF link annotation
    • https://alutat.com/data/file/ladowovajutopuk.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/69290732334.pdfIn PDF document text
    • http://hyundailed.com/upload/editor/file/67284935955.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609843463f214---80412991071.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/031b1c5396f6281ebc678d072d6f19c0/63005514210.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/dmsgcvsee2cc4m68lom0a4ej2i/23782593095.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/o8fr2mreus6dm75mjf2qcjokm7/20819239423.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160722db018369---pawepevukobovigamowumupik.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4656c1f688---ralejekara.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/88218248157.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/87223623571.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/0q4p6q3qqaut46ao7s0pnfcor2/loxuto.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa00921a35a---30421513438.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607233d47f7e7---nutenujujuferagexowe.pdfIn PDF document text
    • http://primehorseproperty.com/userfiles/files/sonebobafojaludipoxir.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/90486830654.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a14cefc2c73---25333067379.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609692bd45aad---15859142071.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/kqc0om2fadlt7sa957qp0ui8fk/7719325058.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/78108573463.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/kivexaso.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/nanurujeferirapusirodawek.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/42119610465.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_off0000ead8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EF 10572 bytes
SHA-256: 9131d0a905aed1f5ae328f4b7838bd25d0b0e68417557a4348688c287eb5e3b2
font_02_sfnt_off00011ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE3 17588 bytes
SHA-256: 21baf1a3d10b78a5ec68c3b225861ea88ed7d9839145fb5744895e13595dd39b

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