Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58894efc8df6f1d…

MALICIOUS

PDF

97.7 KB Created: 2021-07-08 05:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 11193d2d252e8be5f90af2c19b5e5b5f SHA-1: 16a23c19e6b40de45c729b622d41bd424835c09f SHA-256: c58894efc8df6f1db09f5d2a2135a6603c2fb43b0ba3c7da16acee7daa1bd91e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/4df28afdd59731799fd7a25abe849aa0/kaxaxusujowizodole.pdf In PDF document text
    • http://mya1fc.com/files/ckuploads/files/laxorek.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2129e1ff4---7505946396.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ojjpe8d0qdqebr4rjkqr4heue5/68349836451.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608886979c7cb---11243492230.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4f0e1eb24---tekinegojup.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/fpcd4llgjo0g1tbl9j07qv8gvd/83335438103.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/86469873952.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/sasinavisevolan.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9026d2df0---mexosuteputeti.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d12e54cff---joxup.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/mekeletuzol.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f3d083dd7---89240779895.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf137a8e221---48327069538.pdfIn PDF document text
    • https://btegypt.com/file/gosebagogekesupeso.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b456250b48d---wofutimemorimigibogarodi.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f05e7ef779---81188850426.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/06b297d5914984e0e75c8bfe6a204b34/1812958345.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45356de928---55246111365.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/024354f72d5c3a3fa44445bcd1153f93/81756723125.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/tefigovumuj.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/85203a492257751c6d0bc2914e705bd5/diguzalegumubupuj.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/sidoxilozefujulesot.pdfIn PDF document text
    • https://anup.bo/images/files/zifodeduwa.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/8232584178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=abraham+lincoln+a+house+dividedPDF 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_off00011b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B93 10824 bytes
SHA-256: a6c7542f5b7767ba000f46b36097e502f5d205287a9082859f42bc9a4f39b187
font_01_sfnt_off00013459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13459 17288 bytes
SHA-256: 0dca27f2e926d8a06de24c18c11bf1ee5f8cf47c05f6459befd1e77674a9593c
font_02_sfnt_off00016117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16117 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1