Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5cf782e46308d15…

MALICIOUS

PDF

79.1 KB Created: 2021-09-03 19:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 70bd0d4615dc14f5e824fddf24839df1 SHA-1: b804ea75c468eec07651922cf5c56c96ad1a9301 SHA-256: d5cf782e46308d1527c1a2dcb0add2c28163ab1436a4c3d700535187c853d161
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external, potentially malicious sites, which aligns with phishing or SEO manipulation tactics.

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://barcelona-health.com/files/galeria/files/18636222381.pdf In PDF document text
    • https://matfplayer.com/calisma2/files/uploads/76667643814.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/47658780232.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/17gfntu99fmlqpfflg8koi4mrg/wagepakagedavexexum.pdfIn PDF document text
    • http://jarosi.hu/files/file/95589727998.pdfIn PDF document text
    • http://ccapostolicchurch.org/clients/1/19/19d200bce63520a637954fb60b162b1a/File/vepuxuzasepakewas.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210807145605.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/adeb930956d5bc91804a6360e74c6ac6/pamipo.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/nedurofikowadukalor.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/49082213282.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/hcuiko27e0ano0km9lth0s9uf1/37621496190.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/dc2gaktnfcm0sqem4v61eqliq3/nexabujenija.pdfIn PDF document text
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/53288852344.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/7e0caad9d1e9dce7aed3866ddf253287/28309177094.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16076ef2685fa8---fejumozolufida.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/bb53171c425322c89d57ea5a765d6190/95387803197.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/ribeg.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075bdd14552c---luvizegupaxowuvoxe.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/mubijevadazowum.pdfIn PDF document text
    • http://rubensova16.cz/files/file/77115659475.pdfIn PDF document text
    • http://benjamin1908.com/clients/f/f4/f4560e3fe432b95d15e234f900dec36a/File/talizivur.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/b7ca38e1693924dc5a01f102fa985c3e/fafon.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f059fc79e6---35544430191.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607867fb95da7---97831982628.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/67bb95720b31a015571dd25d70fb3b07/nopezejumebexix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=fluke+30+clamp+meter+service+manualPDF 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_off0000cafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFE 10944 bytes
SHA-256: 1658a6a8a718a347db76a579ab1fe4fd7153fac72e0505a821d51c18c7fbfc61
font_01_sfnt_off0000e462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE462 19164 bytes
SHA-256: 0d6e5efa4bacb98cdca6bc192195f28c326751ecfc445080bf8ef5d323d3e5de
font_02_sfnt_off000116d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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