Malicious PDF — malware analysis report

Static analysis result for SHA-256 478d1981234ac5ce…

MALICIOUS

PDF

89.1 KB Created: 2021-08-05 19:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7d9cf46aae38ce77d9a02155150c98ab SHA-1: 6e1855d00b7d57f894b1fdec23fa6908dacb37d4 SHA-256: 478d1981234ac5ce1f6ad65a32858096f46d8bda180f27a5a0211506209d257f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised CMS upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The file's structure and numerous links to other PDFs on various domains support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/88d3423b3f4f78c6789f2080980e7feb/gebudiro.pdf In PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/4c201760b7c7ca8f3ee2389c47e89bd8/57335411018.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/16065790928.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/32262494471.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/dujezoribagagererejusu.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/e9ie0bf5ptkea4v409io9fank2/72904093918.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160719e405a06f---71028309478.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/48193201446.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2a015ac40---xavixujavazeniwew.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/94730279296.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/rekup.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/3ca03b1cf4eb90246750d420a5197e03/jepabutonamen.pdfIn PDF document text
    • http://ledson.ru/upload_picture/nosapigajuje.pdfIn PDF document text
    • http://bscartridge.com/pic/xiwixemesowaf.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/d33d9d0a5f5c682600bc902465c88a12/20455135630.pdfIn PDF document text
    • http://thetownsendfamily.net/clients/a/ab/ab79602242cca8f930cd52af13df1d51/File/gifafudata.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086716340b52---84516622865.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc4049c2d7---jujerumegod.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/xetolateguropexi.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/26607032461.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/tujewolujatokul.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c43603b511d---zunanujusexomi.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e84c2c8829---15754760212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=candide+la+fiche+de+lecturePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF203 10416 bytes
SHA-256: 38f6ea440837915a2f6ce6f02b3744e4943cd27821f43af986ef5981d630aa23
font_01_sfnt_off0001097f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097F 20756 bytes
SHA-256: 8e5ae00682959e99e2e4826f6ffd2b79bf4045f75a486e878fd607243bbd22b7
font_02_sfnt_off00013c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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