Malicious PDF — malware analysis report

Static analysis result for SHA-256 6477eba38599b014…

MALICIOUS

PDF

74.3 KB Created: 2021-07-29 22:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 94a10b4963774a0a33dccf7560ab2ca0 SHA-1: de557b6120926e19fbc6f4c1fc13234cd04ea0ea SHA-256: 6477eba38599b01476637fe3406dec863433c51bfdcaee6fc62ebb4436e6e651
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to obscure the ultimate destination. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and link farm behavior suggest it is intended to lure users to malicious or phishing content, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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 http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/9a7b6d42a01642187b94b7236e45a611/38389569760.pdf In PDF document text
    • http://acpiindia.com/userfiles/file/64178455022.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/vatovo.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/81176989923.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/50708361673.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089a48f308f8---bojikaxazuzowigutewumam.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/pprfuvjs83ucke3kdkc6o1jc55/13372441698.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/korojenekamuse.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c70d696f73---vizewofodederivozado.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/82f032754df34e6783291b666681690c/tajumigivevuzokubajaloko.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747136ba2ba---25046906884.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/21241444700.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/eeb7246e109cbc37de5982d982cf682b/koxirigigew.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d5eb38b9aa16ecb3941d7e643dc0a4f8/doleluwonawilonisifaxa.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b939c8e2d6---ronofisavig.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/9d4e1592176b72f0d45b35af6ae4165f/91452794569.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609201a4a6107---pokazuwetipakotosorusewor.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/latilugafikipexevuzujala.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/98d14aebf05bee48ed3d2ceed25be9db/2335679365.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/56757467667.pdfIn PDF document text
    • https://ecoretras.com/file/baserep.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744b73897d4---sadukagivotevev.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a22e326de6c---43232935719.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/jotige.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/nupubalotokuxirimiwaxakof.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce36de1514---zamefisarufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=manual+trator+massey+ferguson+275+pdfPDF 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_off0000be66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE66 11260 bytes
SHA-256: cf0d3498924e5446b2cc40baef248115e69a245400b21bc3d6f7a5e5fd68d9e6
font_01_sfnt_off0000d8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D2 16436 bytes
SHA-256: 2d643f1ef9fe34c517c12c9bb2c8a596da2097857a97ac9c3fe3df150fdd3a1a
font_02_sfnt_off0001019d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1