Malicious PDF — malware analysis report

Static analysis result for SHA-256 4098b7ac1682792e…

MALICIOUS

PDF

80.7 KB Created: 2021-09-06 10:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 793c66026d388e459298e1f41b44ce42 SHA-1: ade2ec3560061f1c3eb9516cd39e3ea3d4a9818d SHA-256: 4098b7ac1682792e8261070c6b50e4105b89c78ef4072c20f6a0dd0d3e07422d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojanized PDF. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the primary attack pattern involves directing users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://garglob.ru/uplcv?utm_term=floyd+electronic+devices+6th+edition+pdf PDF link annotation
    • https://adikkeempat.com/contents//files/52744554971.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608719dd24644---vumasenabezutewof.pdfIn PDF document text
    • http://neenah1976.com/clients/17995/File/dofofuwasem.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/fasokabegusudokaf.pdfIn PDF document text
    • https://scriptdd.com/_file/file/benopujevamolufifamed.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/likoto.pdfIn PDF document text
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/65989773107.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a2d49b2e0---tetodulavum.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/ebadf3bcb97b7612e48f8d07c661a698/sajufunuruxi.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/b62db3ac1670f17d5d434f5380a4b1df/643010004.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611829d13b46f---1379605424.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/borejivutaromejij.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/1304793986.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/67307959597.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/79ee593854c87fa99ad474f7e1f1b28e/nibumo.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/lejezeve.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/0a1b101abd7cc7e8d746c8d84f13be68/82225792835.pdfIn PDF document text
    • https://soechi.com/userfiles/file/feluz.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/3j27podkreqjppoho2nu8s1pq1/redowotewibawipanejeta.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16088a9d2185c6---lizadigololawepotalugibob.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210627_5765F0A727609514.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69eacbf8ba---jaxilotafalasizaku.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9f0276e1f---24540849618.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/64604416da6ea3e09c25ef486756e549/25983936993.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_off0000d7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B4 10880 bytes
SHA-256: 8c6555ff222a638cc0a8eaf50c1e4171f357007402c64d2f1e87bf0e8486618e
font_01_sfnt_off0000f0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D7 17244 bytes
SHA-256: 671879049ba247bc4bd2f34e0161f5c277ee3acbfff6150f53d1f13019a36ea4

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