Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e1ababeb344aea9…

MALICIOUS

PDF

104.2 KB Created: 2021-07-07 05:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aa91a3abd9be634b533a6de9c8909c09 SHA-1: 8827bea079fca3d14ebfee2f3a54ef05c874a48d SHA-256: 6e1ababeb344aea9d3a3fe1d388a11aad92c5c867f723ab47087639d340bf785
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://szpk.hu/_user/file/jelesiwutaf.pdf In PDF document text
    • https://austarpharma.com/upload/files/87637613254.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/4a6af9f6969f55fea24d4364d8058001/tawuxomuwoferekow.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a92f4365b78e43a9566cb58c08f849ed/44910328269.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090bef72cbb9---66094720255.pdfIn PDF document text
    • http://calzaturificiocatia.it/userfiles/files/36795753865.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/u6tjnan4c46a94r480c3ju0vu0/pinejiju.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/xafimekufos.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/11155305605.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/27e9c799cc6178af5501289086239e89/xiviwuti.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210627232103_tsg371.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/mesij.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/a83d56eef14cc8229147697f05b1f265/xesutix.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe8bbbbaea---13671323742.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/70567214837.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/73bf06fa7516807357a04923a6385938/soxene.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/qiaa368r7jesjp7hrrardgu6b2/71553455994.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce70e39f71---21945130934.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/jrvi26el1u33r13tadninl7k93/73704641496.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/givadabolegasadiwadog.pdfIn PDF document text
    • http://manajrgvaaradhi.com/cms-uploads/files/92636285512.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=definition+of+base+units+in+physicsPDF 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_off00012c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14457 20776 bytes
SHA-256: 4b75bf23a34ead4217d2146dd3bc49369e8069ce226203e47bfc774be2c02446
font_02_sfnt_off00017b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B38 10784 bytes
SHA-256: 82f982699039864bca2563e30d8034673359275632141782b1f14ba988cc1350

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