Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfa3506b65963896…

MALICIOUS

PDF

97.7 KB Created: 2021-08-23 10:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 22faf56753d4b7b647ee44254856255f SHA-1: 014e743f2e3411f5fb77b7fe2796179682192f00 SHA-256: dfa3506b65963896fd323a99f6e85a61231a866c277a0269bad1958b1840b96c
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 point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://cructi.ru/uplcv?utm_term=rome+total+war+gaul+strategy PDF link annotation
    • http://iamsong.vn/uploads/files/91351384702.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/zufegafojapowazete.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f30e3b23d---narutometepumo.pdfIn PDF document text
    • http://merwepizza.com/upload/file/wuganovuv.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/44j4tt5pngauq23hev3s13mjh1/48521058262.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/kosaduxogufasa.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/juxufoveziv.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/43315929349.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/1cd97b31ecd5b16a110142afa8ac2779/mojamufadopufubod.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/dba3596b28d6894e30bcb31765f45e7e/dapawufozomamapop.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/kifagomujomitukiginemopeb.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/81285956895.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/81349821875.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/48c279e5ba7a5efde4202bbb2cb558df/20185992397.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/12951608661.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/75427105387.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16080b48e7a0c3---6259759134.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/zimipij.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/zupatakipatekudinobamob.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/1140898383.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad97ea2af---70403342024.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/datoja.pdfIn PDF document text
    • https://triosms.com/userfiles/file/folofaxopet.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_off00011c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13426 10600 bytes
SHA-256: 0db9dc2d249565d601199b4163a5521fac9ced72aef7e8febcc20f072c8117c3
font_02_sfnt_off00014c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C89 17060 bytes
SHA-256: af1f7140f5a4a85b2991e2dc98a17e5ac53e1b253c19ce0385bc35b04325abd4