Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d6b85026781b4af…

MALICIOUS

PDF

78.0 KB Created: 2021-09-19 17:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e91630e1b3a98f0bd40de495f92b5b88 SHA-1: 28e7c2cb2c4789482cd2f6bd83791463e8b992b2 SHA-256: 2d6b85026781b4af3b46c197ea3f420d05e14431b3eba2b964c2c328a46e1090
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://cructi.ru/uplcv?utm_term=kanmaniye+punyam+nee+song+mp3+download PDF link annotation
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/j1hkdjuv37fknc80caehjtb986/kelix.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161319de2168f9---zalinajanopuru.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/17136559352.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/xinoxopu.pdfIn PDF document text
    • https://sambelteri.com/contents/files/kazoborejoxokoluteje.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/buvasig.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/fovajijefu.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/gifivipujumefesefumakusa.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/3539150783.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/41736516870.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ec3713bee---64489831679.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142854a20204---31345203623.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/kewifufusivolonud.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/47315629382.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/tevevixokad.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/72dc7120a2b1c9a8d2c00b14e89c6dc7/rimeb.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/tefemofum.pdfIn PDF document text
    • http://kotolantopeni.cz/file/toziratobufelatonoz.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/dovovixazapowaruwo.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/pujesuwire.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/6jca1pn0i6rm7kpl7ev2a6irm2/51971700479.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/nodimuwudofefonem.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/zuremume.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_off0000c9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C7 11000 bytes
SHA-256: 561311ac63ee22a769d849e9b018638787d34646522d4d14e974586c043b4308
font_02_sfnt_off0000fb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB28 18256 bytes
SHA-256: 019f46c6bc3df8218a41adb712dfdd9d16faa385a8ee921c91524bdb52e664fc

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