Malicious PDF — malware analysis report

Static analysis result for SHA-256 255daef86a0eee07…

MALICIOUS

PDF

93.4 KB Created: 2021-07-22 16:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e14ea30b6c0d0f3dec27852d365573b3 SHA-1: 752cbc77c871bc9d0370d1c65a90133ae6d16555 SHA-256: 255daef86a0eee07748bff9bf95bc8cda67600bb8fe8ac11002ee92adca4c50e
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links suggests an attempt to leverage vulnerable web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://airconbank.com/upload/fckeditor/file/51698609747.pdf In PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfc8c85a6c---nudavubunile.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/22748633239.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/5snr0ktr0sti6b0acg1ehaqr86/75295450008.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/pirewoxiget.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/39500428443.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/51433093087.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/174e3a5fa17fb7e43a4ea40deeb47542/sevujovipo.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/57787332809.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/fekivez.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210722135137.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/lalujoxifizegajufalejefud.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071873694fd3---41237603327.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/b8551fd9b443ea67d02960281e5bd1f6/97329068959.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/ragusadikig.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc03243ad9---64828462127.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/ganasejigelotov.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cf276617c---jogexemenufoj.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/ruletegoxefefobewenona.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160af79b076fbd---53512722598.pdfIn PDF document text
    • http://k1a.ru/images/files/file/rimamaripoj.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/45499989457.pdfIn PDF document text
    • https://wecareprogram.org/images/file/4128580500.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/52373503281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+do+you+quote+an+article+in+an+essayPDF 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_off000108fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FC 17384 bytes
SHA-256: c958a246bd400a184d2e784255d532a5ac63233df64ca13e39e25da0fabf3de5
font_01_sfnt_off00013617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13617 10800 bytes
SHA-256: 02f31a82b8905254922f58084ef97c686d292a6d4a10d4473ec73591a4b91b61
font_02_sfnt_off00014ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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