Malicious PDF — malware analysis report

Static analysis result for SHA-256 84fec30a5535b7f0…

MALICIOUS

PDF

87.6 KB Created: 2021-07-01 09:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 906f69399f29ba368790f53cd341e6ec SHA-1: 01a5d3e7f0afeaaff1a749f4844633aa8d380184 SHA-256: 84fec30a5535b7f0a224129552685c1b8febb6e4595df8f4ce4e4b4278cde202
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://centralcogtc.com/uploads/file/nepamudapizowogo.pdf In PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607496c997901---74424201367.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e3c3c180b---82044544924.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/74140456310.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16079c3bb47086---bulujapawulamivemajugag.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/0d7efdce48b97a04e33379e5e2b82a72/96838303031.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/ropejuxirabagipopinalulef.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16077eff11aeab---76306665732.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/53946319530.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a579bd76588---11491118629.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/zumelosa.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160966c21a4723---zawape.pdfIn PDF document text
    • https://vestol.bg/files/file/5092122249.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/b558f593fb1061b3e42b668e80a032be/64042604122.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7084909f9---77696410409.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/gebifuj.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/visofivafufinatosase.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/4dnp5jqu0v251qgdqi2g8gis08/lokaturijipigumoxad.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/kakigiwegudi.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/1abc85ee28f9109eaf1185d950a321db/wuvovugikuvi.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/d2537efbbb6c1571489795191218c3d5/89870816721.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/vonirikurowoves.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=glucose+pp+meansPDF 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_off0000f590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF590 17148 bytes
SHA-256: 17a3910b92b8b0b9eb48aef5e233c8ce37873207258543b67d459ec917aac037
font_01_sfnt_off0001220d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220D 10384 bytes
SHA-256: 5e409acb7c2af30fd03f34141949bc6f707270901ea4293cbfa40afefd326aab
font_02_sfnt_off00013995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13995 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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