Malicious PDF — malware analysis report

Static analysis result for SHA-256 90975769dd4529ac…

MALICIOUS

PDF

72.7 KB Created: 2021-09-01 16:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0eb014db8af8e247a3d7fedf44dd1b0d SHA-1: 4ff360cb08719b613c01b60a3479b851e816a1eb SHA-256: 90975769dd4529ac147b96e2a48dafc0434999be1a86be4c32933c6e539a3cd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, likely intended to redirect users to phishing sites or download further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests these links are hosted on disposable domains, a common tactic for evading detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://catamma.ru/uplcv?utm_term=skeletal+muscle+structure+function+and+plasticity+pdf PDF link annotation
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c6738747856a2993d9d2d2caa0b1bad1/xakelilajasisimawazovi.pdfIn PDF document text
    • https://x-software.cz/data/file/88437839344.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905b26d096d---jumige.pdfIn PDF document text
    • http://kme-kme.cz/files/file/rolibamivudelogijumi.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/18980580102.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/d0b9f08b0be5134c4318938a6f0195c8/68763915589.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/benudar.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe9bf2da03---85134274490.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f495efb9c---wipexonewitabofopazukaxa.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/fd44v85ul1jgud6ckfkq7rtg27/9120312381.pdfIn PDF document text
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/43424223431.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9c05e2eef---33145134644.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/pebuzexobujo.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a175c8e2c3c---nabegavafuxolofokotubi.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/lalivuxaguw.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/xogukage.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/pofalefimoxowarutaze.pdfIn PDF document text
    • https://agermag.ro/mm/file/74868899746.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9e44c1622236e9d8a6f387134b9ee545/19229035513.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/c39e31f4fbb907955e652b019ed99357/fibawijalekusoxokama.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e78833bc949---24112395302.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/34906272137.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/rulifiwumituluzetimat.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/zogiruwafap.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610d8e7669eb5---32860306559.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94b320aab1---989481736.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_off0000bcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF4 11164 bytes
SHA-256: 87f304646199be523d141807f9501a5a5cbbb3aee8554ff3c16e309ecf394633
font_01_sfnt_off0000d70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70A 14636 bytes
SHA-256: 6dd252e27a5ebdb1e7d71e6b42f3d2676925c463fff6865b4f4900846ec324c0
font_02_sfnt_off0000fb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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