Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f6457b7a421856c…

MALICIOUS

PDF

85.6 KB Created: 2021-09-05 14:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c39b3fe893336abd291c3a3bf5f10d34 SHA-1: b701596605204cd4ebe945d1d12653dd1d1d4af2 SHA-256: 6f6457b7a421856ccf84c34e8b02908827c4a56b782a7e378cdc58803e45b41f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, directing users to potentially compromised websites. Heuristics indicate these links are used for SEO poisoning and point to disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=wbp+constable+syllabus+2018+pdf+download PDF link annotation
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/2b835463a9c5ffea9acd6af803a8e2d5/57410212463.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/28579761747.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ea6eac5d52d18da1934cb26037ecdf2/38362783319.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/govixaduxim.pdfIn PDF document text
    • http://fastgood4cheap.com/clients/4890/File/52852952671.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/pezatig.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/3250113513.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/b7ri16il65aelaevj2c6qpif9q/nenuwivabowimejegiboxa.pdfIn PDF document text
    • http://bdata.vn/upload/files/fapefexabegepowemogos.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/4ee74c326835f79ef495a7b9fe465625/jasemobuwerivolerute.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/72193840250.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115f2f7f01c5---polulubexowe.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/62223885452.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/26823479532.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a331e28bcec---lakafa.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/tuxibi.pdfIn PDF document text
    • http://mextro.de/upload/files/44707897597.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/lakeboge.pdfIn PDF document text
    • https://85097781.com/upload/files/kenep.pdfIn PDF document text
    • http://funperm.ru/content/file/nitusubevelujaxuxuloje.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/jopewegeleb.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c52be438d62---72997049235.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/81114771905.pdfIn PDF document text
    • http://poorclarescork.ie/images/66810108241.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_off0000e5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AC 18244 bytes
SHA-256: af5932b520a6f0f3b4b4b5f5b2528b28e382a0372fc8b075f90c10f86d05d963
font_01_sfnt_off0001151b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151B 11356 bytes
SHA-256: 3aa7525d56bdbbd133c1e2db360e9ed6d065fed4cb288510a7388c72ac06ae0b
font_02_sfnt_off00013001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13001 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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