Malicious PDF — malware analysis report

Static analysis result for SHA-256 881c2d33e097b474…

MALICIOUS

PDF

83.3 KB Created: 2021-09-02 01:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2084310a56770fc8994914ce7fc32c53 SHA-1: e9a322af6c7f3e689cb5315accd6386c16f9daca SHA-256: 881c2d33e097b4740b4275c8c72ee4bcaff07b3fc94d44c31a959b17eb7c3a85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm used to distribute malicious content. The embedded URLs, such as 'https://laborke.ru/uplcv?utm_term=job+interview+questions+answers+pdf', are likely used to redirect users to further malicious sites or download additional payloads, disguised as job interview resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://laborke.ru/uplcv?utm_term=job+interview+questions+answers+pdf PDF link annotation
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a14bb4b83---23417233644.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16110007bba4bb---gepagowanivege.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16098330e5b100---74036248753.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/70234413318.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210704004759134.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/u90dfo014ctdqmrefj7u8tn6k3/marogozolakibevuziruso.pdfIn PDF document text
    • https://mimpidia.com/contents//files/netowapuzuwiwarolofekekon.pdfIn PDF document text
    • http://keacg.com/upload/files/ronuwidujoxivukotuzop.pdfIn PDF document text
    • https://bachson.net/upload/file/fafavepi.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/fr1odmmob1vucf9tdj0kbbn59t/19653759727.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/62330102264.pdfIn PDF document text
    • http://dentistturkey.com/image/files/banujolepoxovexapese.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/nv11mtc7nnb4bvg44b77pnonf6/woxulogiwok.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/9290c904b51e244832a532088d6a5b7a/garog.pdfIn PDF document text
    • http://safetypath.net/cms_images/16618064474.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/sitarojetegi.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/putajuviza.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160954e0bd1e4c---48187539617.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/tanalozufutoz.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/97292191404.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/14899720518.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/45962158094.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_off0000dfee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEE 10972 bytes
SHA-256: 3f4717a48fa211ec8cee2c0c93caa152f4c7cd61ec20c0437da7cd1dfde4e989
font_01_sfnt_off0000f92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92E 18040 bytes
SHA-256: d5751b11990b1429899bb0f41412eaba034d2b6317a86b36183dcad953a77147
font_02_sfnt_off000127b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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