Malicious PDF — malware analysis report

Static analysis result for SHA-256 c801f75090dd013f…

MALICIOUS

PDF

87.7 KB Created: 2021-09-03 19:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0c3c9127872316fbc5538ad93d3dfe79 SHA-1: 6c7eded71baaf8ca312dfd7a9fa0b9c6d0bdfd22 SHA-256: c801f75090dd013f009efb78219985c3731bc5b72918beee48658a0ca5629a28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and embedded URLs point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ascensionchina.com/userfiles/file/nojelodufikowabe.pdf In PDF document text
    • http://sumterhigh89.com/clients/863574/File/fevirorunewime.pdfIn PDF document text
    • http://gchs1966.com/clients/2/2f/2f663f305105093038a7fc4b193dd8f8/File/99122786486.pdfIn PDF document text
    • http://mamitobe.ru/files/file/83926637571.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/v4cmuoonjqjfpj51ltrc1mb66r/gegabesiwodarepok.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/64341110470.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/wipokipusumujifusobajaja.pdfIn PDF document text
    • http://15889163.com/ckupload/files/taleretukewidepolox.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/6c139ec4bfa0e0d41447f020dfd83c48/53290959035.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/timebimo.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/vixewimipajinopuriwutiz.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/ab5cvureq08o90isj2jk3hgl65/44597858284.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/74651786107.pdfIn PDF document text
    • https://ijpdua.com/contents//files/1030259396.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/17207475257.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/mubuvakukagoxelizegiwow.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/68419125919.pdfIn PDF document text
    • https://norservis.com/files/files/nuximapabaferil.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be5b9f31829---16036629253.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2020a81889---1111564281.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/g1kso5gqj7i3fk26c94iqk5i65/45523864125.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8edec132d9---femupomowarozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=latest+ministerial+handbook+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF074 10952 bytes
SHA-256: 7af7ba1188757a52a1f4d4c5b7164f6eec297bd1d54c0a67e0e5200e3eb1857c
font_01_sfnt_off0001095f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12171 18224 bytes
SHA-256: 101ba76dcf22049c356e81c8286af2f3a2e69b1972aa92eab51b1c6ff0f13025

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