Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3dd938a45ec5475…

MALICIOUS

PDF

73.5 KB Created: 2021-08-31 19:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 84ee18d5e852b6f70eab7e64e8d512b8 SHA-1: 3149a2901c2bb574f380e27257ef5668cc84300e SHA-256: b3dd938a45ec54751234b8291704eb08f750397971b8271194ddc9c7e024e0f6
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=dialogues+everyday+conversations+english PDF link annotation
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752af6655a0---ligulijivifunovol.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/tetemedukibama.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/21331629496.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/duxifujativoguzig.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a49c020be98---wurukamolo.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160bf17a07511a---kudenefisuxebeninure.pdfIn PDF document text
    • http://edgecs.net/documents/28037508932.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/86683998034.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/495bunbq2ui9jtpropjhgtajdq/17606220116.pdfIn PDF document text
    • http://hphs1958reunion.com/clients/47465/File/94513836296.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/geximolu.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/25521677764.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/e29466ab0fb182c6dc05e344c0c1418f/98574426681.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/fikuxomakitubafazu.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/30246881380.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c96ec09d91---lesiziwemotuwulodif.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/9f27bb499238cdeeeb2ac7a1955c147e/36607792828.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/baraba.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210807085240.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/q6g1pshu6j5331v1bap276fk13/45097394066.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/3491779109.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/aaa1bf194804d894dd8a94b3b2df2808/28281536244.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160da9b5c738c3---63907550885.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/5eb6f43986e627d414a71a3cc5f80626/43659097546.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_off0000bc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC46 10928 bytes
SHA-256: bc75bd6c2dc4874467bb8a70d36ddefc08d1d1403a1e92e72c678ee443f7914a
font_01_sfnt_off0000d561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD561 16720 bytes
SHA-256: 2df7fe23af9504f9db3c6be389ac560b08ec9199d9261a9b3d2382f063996291
font_02_sfnt_off0001000e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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