Malicious PDF — malware analysis report

Static analysis result for SHA-256 03e5655c616ca506…

MALICIOUS

PDF

102.4 KB Created: 2021-07-04 21:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 27fb6bcc9dba8d1bef96d37bacf6ded3 SHA-1: 2475224637496335fb2147a5f4302008f4d9d021 SHA-256: 03e5655c616ca506d72078dfee1d2872b4fde3fb078814f2d2d249381c7d0a20
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other domains, likely for phishing or malware distribution. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://krisoc.ru/uplcv?utm_term=ethico+moral+meaning PDF link annotation
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/eks7jildi0jb852ag0mq4vu3oo/birejufipofusavigotub.pdfIn PDF document text
    • http://wami.cc/data/files/98214631754.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/viguraxo.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/3246510740.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082e0c20e004---kinemivamisiri.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/sugevosusosotaroririlepim.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/bf507e95d105c8dc14c37c2474d3113d/32886451049.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160937f667243c---jovemufefa.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/simonu.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/e6f3030f9fb90571d52f80404f9a60dc/gekuguriwaxoz.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/rewevagofowakowosajufumiw.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/6531978251.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dadcdf3be1f---lusamevasuzefasebive.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/f032b28ccb5eeefe41af573e9124221e/kugukiko.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c473a605033---21420989299.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/kutifi.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606d61568a56e---58817587645.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/daf3e4e25b6d9cc98e64e951cb1b643c/perufovotikojidirire.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/m94l4ljdn5fe0d06c7vdh6v46u/xurewovakaruzomuramaxo.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/zegorifolusigesunog.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/b881644d844e6f3fa5dcd6e430cd7841/58277872730.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078335359230---bupijifaji.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/pafilugex.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/fonozev.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_off00013010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13010 10492 bytes
SHA-256: d8e392902cfafe8b2660df5a6e04a9a1ce79f5873f27b044375df2ae600a9bdf
font_01_sfnt_off000147aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147AA 17196 bytes
SHA-256: 56675c457424f032830abd5de49b255ce20d0f5befcdf822a61a14114c35f856
font_02_sfnt_off0001747b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1747B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.