Malicious PDF — malware analysis report

Static analysis result for SHA-256 6767c12012b9d813…

MALICIOUS

PDF

91.9 KB Created: 2021-09-14 09:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9b11d7d406c76fad0e4114364f230725 SHA-1: 313d011f33ecb0dad6c429139f43940861c2a578 SHA-256: 6767c12012b9d8136b1d186280892b8a066da8ca44c6eeaa5d5a6d612b26ec83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. The presence of external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

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 http://zeci.nl/im/image/16541999736.pdf In PDF document text
    • http://askort.pl/Upload/file/14569185228.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/nunujokegus.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/vijosubaxesoboxepulufu.pdfIn PDF document text
    • https://uangraja.com/contents/files/2550559265.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/18370824850.pdfIn PDF document text
    • http://designgaleria.hu/userfiles/file/woxelelew.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/kejuroguv.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/3996338050.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/99486715047.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/kobara.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/49124207695.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/kenililami.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/83919019095.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/a6f5431c4c6cbbf6c0f9cb25a1f13a49/19946273004.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/ralaxuwatitifi.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/38350121773.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161304d5c458db---72131267879.pdfIn PDF document text
    • http://airmon.hu/images/files/vuxufu.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/49269407345.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/mabafazapalaliwoluxola.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/73e26a40e155cae10b31ae1c1b5af1fd/pinapogiro.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/80044554024.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b71275e36b---29641148056.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=zombie+frontier+4PDF link annotation
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4B 16080 bytes
SHA-256: 6ec0a307146d9be2bdd9dd9a35227856c774c3cce985d3f038f6c9b4f02e256a
font_01_sfnt_off0000ef7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7F 10180 bytes
SHA-256: ca4c2c864ababf106f5cdccd411db7389eb612da0b4a89744648cd53a2e2d421
font_02_sfnt_off00010647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10647 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_03_sfnt_off00010ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECD 23164 bytes
SHA-256: e06b24abefd5fff4fcf52f3681f712a1f33328e7684e564ce0e639f2f3ab60a6
font_04_sfnt_off00014905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14905 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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