Malicious PDF — malware analysis report

Static analysis result for SHA-256 79af422ce1639a26…

MALICIOUS

PDF

82.1 KB Created: 2021-09-13 21:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 11d1a799a106034630cfaa2027f78744 SHA-1: 6a03e17b180b7033c3913b968cf22592c33a7569 SHA-256: 79af422ce1639a26cd149bb60dbdc8b3df368983a721a2d3b5a588ddfeaa3390
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://pixomot.ru/uplcv?utm_term=7+divine+laws+book+pdf PDF link annotation
    • https://khabul.mn/mmpa/userfiles/files/72992448945.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf819387b3---tatupawivase.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/mewaposodogivanelif.pdfIn PDF document text
    • https://ksuskalology.com/images/file/12020560221.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/9358165847.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/nixasuvibaseti.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4f8ed87f0---fokukubomebudewiga.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/nezexow.pdfIn PDF document text
    • http://inercial.es/uploads/files/mupunatexoze.pdfIn PDF document text
    • http://i-tos.com/userData/board/file/jazumutodepegodozax.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/5001102940.pdfIn PDF document text
    • https://scalping.ir/data/files/file/86283229791.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/daraxilolaralireja.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/6b1e875b3aeee1bd38943a7810e05159/7742140242.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/60214337469.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c91f90e08---67167067885.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/kirerapola.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/palovisavuda.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139b73f93182---67362540163.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/zadonasilodumutapifonunap.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/9n4fb05lff30ai96rd06vj827q/98432878508.pdfIn PDF document text
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/71539655626.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_off0000d90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90B 19120 bytes
SHA-256: cefc6fc0186645dfd485f4e4b3fcff19ad6d28d73e694d79bad6350e0e74bbaa
font_01_sfnt_off00010af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF4 10628 bytes
SHA-256: 77bfce07221660cb7500d39174f63856d36e1e71f237c1d9ac7974f719ac9e6e
font_02_sfnt_off00012340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12340 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1