Malicious PDF — malware analysis report

Static analysis result for SHA-256 0acc723541319c39…

MALICIOUS

PDF

84.9 KB Created: 2021-09-02 09:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 31cf1e69b3c09a07062603aa1abf0c1c SHA-1: 991de37161562b9f72f1c49dd87f8ea0477ccd69 SHA-256: 0acc723541319c39bf6a213d6c2013697b1719567ffdf68b40fd47b9eb3a8b03
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs that point to compromised websites and potentially malicious content, indicative of a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=physics+principles+and+problems+chapter+10+study+guide+answers PDF link annotation
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/58fa6225af0388b34c9e50299b19c6ef/megefogowegiwatejutupinev.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b10f2276ec---64573447880.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/gadazupalikil.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b332f44730---kebar.pdfIn PDF document text
    • http://crediramasrl.it/public/file/93316728912.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/midum.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/23195225177.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57fa49a765---vetiwilibitexe.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/b3b43429a6b4097e51cb6e443dcb5a93/4489396016.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/51948969500.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/xunetatifu.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160964ccaf157b---bitedaxazorawirege.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a89b3e6387---fotiwezunepafib.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/xidol.pdfIn PDF document text
    • http://elitvorota.ru/f/file/vofamoniguv.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/55ff0ed57b70d8905c99908e62e5f994/34650549962.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/zigebuxavetomu.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/80846938833.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af322902cf1---10721137795.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/r9p3khi26iecfjf3kb1moq273i/gukewedixuj.pdfIn PDF document text
    • https://spacio.hk/attachment/file/83010142311.pdfIn PDF document text
    • http://sciattella.net/images/file/38569418228.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/39457725504.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/d17958240b5ad663796bf0768f293953/dumedu.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/28794998335.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_off0000e3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F7 17180 bytes
SHA-256: 4b023ccf2087cd26b4d82438745c177144a40f6afcb4559094ced614b99b6577
font_01_sfnt_off00010fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12801 11576 bytes
SHA-256: c06682930448bda5e7e414670178d771b00d558225990e5fe0819cdaa17298f4