Malicious PDF — malware analysis report

Static analysis result for SHA-256 3927703d7b3aeaf0…

MALICIOUS

PDF

72.9 KB Created: 2021-09-16 12:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6431ed784aeacffc550a4627ec4fa19c SHA-1: b232f9d99d729ec8b44ff2ab075a9e7e43473243 SHA-256: 3927703d7b3aeaf0ca9249f4304891275ef2542bbe05d2d74213f8a9c9db6f18
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are identified as a link farm pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://lucchetta.net/userfiles/files/putedaxadubezad.pdf In PDF document text
    • http://goldia.cz/data/file/gumujopotulekikabafoxu.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/sovometudomafufonunosete.pdfIn PDF document text
    • https://mauspro.net/upload/files/werowepojawili.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45600693736.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/80877129130.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/66867398249.pdfIn PDF document text
    • http://zae.me/datafiles/file/zosarogivobofejo.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/63076519811.pdfIn PDF document text
    • https://unitjaya.com/contents/files/68303914225.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161416f9a13b0f---panuxitugako.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/24973772880.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/1896501953c5b9d1a58227c914701e8b/40091065605.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/30519527819.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/79428050672.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/52746134137.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/1e468c5e2894f2d21e8c3264963a587d/37401707559.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613558e67324a---59980092560.pdfIn PDF document text
    • http://asid.rw/userfiles/file/96317003841.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/26782704499.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16138b6144d2d9---68550388946.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137b6f4dab8b---gekelebetowuzefalulovini.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/28988014555.pdfIn PDF document text
    • http://brukbet.com/user_images/file/xelog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=b+flat+scale+flute+finger+chartPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/2eda1ac16447eefc481f5ea086ac40eb/67900550574.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_off0000bbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD406 10648 bytes
SHA-256: af48bdc852d031a737b6abfe4ec470eb5650ffc63dc60655c9048ef90a633c6b
font_02_sfnt_off0000ec59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC59 16104 bytes
SHA-256: cb599b9b665c7ccfc091912f55e449f037c971da6ba197a1e273b9c35dec4a81