Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c86971c11998fab…

MALICIOUS

PDF

94.9 KB Created: 2021-07-18 05:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d2ddd5dee40725bacbaf949635002641 SHA-1: 87b91c5bd94a366e3b87c2e41e1c22ea9395bf56 SHA-256: 0c86971c11998fabfbe158e1e7f7c80cbb326d678b6fc781b48cf80bd7bf9d82
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. ClamAV and ML heuristics confirm its malicious nature, classifying it as a phishing trojan. The primary attack pattern involves luring users through a document that hosts a farm of potentially malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa8e6bf8da---38070251007.pdf In PDF document text
    • http://architects-desk.com/uploadsfile/nuvukagon.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/285d38035a1564f41057bbec62cdad68/20013430619.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/lakazujozekenopufuronotut.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/jimepunovidesamifipofer.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94f4bce324---kituze.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbe1c0712a---38148807889.pdfIn PDF document text
    • http://deauville.ru/files/file/98067216227.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3b034b9f---46059155607.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/zopajij.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/93768871966.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/kanuxusavoxexozafuno.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c275d5e74b5---vokufiker.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086c3f3446e2---veren.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d854479c0---74906859245.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/paridowewisojix.pdfIn PDF document text
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/59910606878.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/89327470059.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609d883dd2a4f---35398910988.pdfIn PDF document text
    • http://erpos.sk/data/files/75712222668.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ae1a3d849---41968485780.pdfIn PDF document text
    • https://parc-hotel.info/file/73464132946.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/sasazopetoboririzuna.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a372bd9f323---33789548809.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/30698223433.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=laws+of+rational+exponentsPDF 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_off00010bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12412 10496 bytes
SHA-256: 6672dbbe6a1371426111f39efdf0982d5f7afedf520ce77e931caa7eb99270a9
font_02_sfnt_off00013c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C26 18444 bytes
SHA-256: f950962d364e263a1cb1a7f9edb8fe89bb3d9701fa31c9a95d82f4edc02f8bdb

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