Malicious PDF — malware analysis report

Static analysis result for SHA-256 681acda70ab3b53c…

MALICIOUS

PDF

80.1 KB Created: 2021-06-09 23:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e54dd03aaea7c959eaf2d7b89b7cb882 SHA-1: 9058e2475ab0f4563f799d9d05db1abbd3db12dc SHA-256: 681acda70ab3b53c7159715f4cc3dd65d2d6a790a725073a7edf443a7253e759
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed for SEO manipulation or phishing. The presence of a URL with a 'watch avengers endgame movie free online' UTM term indicates a lure to entice users to click potentially malicious links. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its deceptive content and link structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://garglob.ru/uplcv?utm_term=watch+avengers+endgame+movie+free+online PDF link annotation
    • http://alexhoffordphotography.com/temp/files/file/pukav.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/18a7d631948a2355804cb03400bef5b2/30138405804.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0195700001619798082.pdfIn PDF document text
    • http://noahsmarinesurveyors.ca/userfiles/file/wovusudux.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/c3f9e3cca04e54343f1f1ae99859a30e/68151676760.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/44435034472.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/f81bd13843ab8823cb6620c7adb6a182/16370614187.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/ot5g99jhtt6up1ptnv9lip5mng/pisamiboduzilegiberupubat.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815462e3bbb---88259049952.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74e0a572f6---43343503575.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/06/files/210606140219.pdfIn PDF document text
    • http://klpa.net/userData/board/file/98913374635.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/turijofexebebi.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ac4ed9709---tirofezokafomanawu.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff505cdd26---93678901988.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1ef1f1527---gipirew.pdfIn PDF document text
    • http://axwelindia.com/uploads/kinevokazu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAA 5508 bytes
SHA-256: 273afe7f91f9ce5f1e55041815e318683c539e548b1e4ec4f4037c585fb9e306
font_01_sfnt_off00010d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4E 11100 bytes
SHA-256: ce50e4207bc236c0e83ca7d8c11b0198d1b9bdbff74a13d3a2572ea17094b3f7