Malicious PDF — malware analysis report

Static analysis result for SHA-256 3467dbcbeb502d5a…

MALICIOUS

PDF

80.3 KB Created: 2021-08-12 00:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 657d8db53683ceb8901a8cbaf5b75e0d SHA-1: 2a290c8ace177ab1975ca63e00a3c3cf1d423fad SHA-256: 3467dbcbeb502d5acfe8efe1530a5b3274c68be1c81244cfee3bcb7701a8460e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=dict%C3%A9es+picot+cm1+cm2+tome+1
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/a17d5b84bad7a387313746f71acf7d79/tiwawanimoxuzux.pdf
    • https://himalmanpower.com/ckfinder/userfiles/files/53638134851.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161105e5d539e6---80263329970.pdf
    • https://gionggiacam.com/ckfinder/userfiles/files/18308022608.pdf
    • http://alexlunacoach.com/img/editor/file/83427923126.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b486acd1d47---96969956605.pdf
    • https://bahispesinde.com/gnc/veri/_files/nexunetimefiranu.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/7si4purqm6bi6ctuma1fkmjg77/nipole.pdf
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/kixitoxuregitadedokidivad.pdf
    • http://rainesclassof1980.com/clients/3/31/314d3ac3c31ee16cfc8f78d457af0ebc/File/derudibevawaxafo.pdf
    • http://yogo110.com/userfiles/file/tovimudirol.pdf
    • http://henghuitong.com/jingkelun/userfiles/files/20210703162654.pdf
    • https://sokolzgierz.pl/web/uploads/files/43220056589.pdf
    • https://masini-de-ambalat.ro/images/userfiles/76042783162.pdf
    • http://giadinhlaurenso.org/upload/files/lulowubab.pdf
    • http://phuongninhphat.com/uploads/userfiles/file/41294215570.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607479f44b188---40859510597.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/fulekapevotipuw.pdf
    • http://cellesekorea.com/ckupload/files/46913781757.pdf
    • https://gegeny.hu/uploads/file/bejexuseku.pdf
    • http://tajeer.co/userfiles/file/34872480522.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078397ce38f9---11375049962.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/b4ec55a7c44792ebf4664eae2816d0f3/76316836287.pdf
    • http://koryosushi.com/uploads/files/xowabemuguzixosexuf.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8631a7dfe---simoxepirevegeramipe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d10f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD10F 16792 bytes
font_01_sfnt_off0000e926.bin
67d78176229f560f96257c197bc990e3b9d75f6a7a16d6e4cedb74907c88b6a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE926 10452 bytes
font_02_sfnt_off000100b9.bin
d9f368394bb4ebb47fd384cb0120fece8e8fb7f7683f960c6313dfb7de921fc4
pdf-font-stream PDF embedded font (sfnt) at offset 0x100B9 18768 bytes