Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f5acf44a254ad5b…

MALICIOUS

PDF

81.9 KB Created: 2021-10-16 22:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cefd0d65ddfdae13efd1c315c8508987 SHA-1: ed25a6042179a2e639bcc27a52fe8c08feb0ef92 SHA-256: 9f5acf44a254ad5b662b5ed62ce95eed5699af288ae1f6d43c9f522b1baa1d56
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and embedded links strongly suggest an attempt to exploit users by directing them to malicious or compromised external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=picked+up+the+pace PDF link annotation
    • http://petrovaskola.sk/userfiles/imagefile/95758007299.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16141f26fba8b1---pasenoze.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210909092516994.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/96186665013.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158bfb869907---39276748561.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/wojituxeganosivegi.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021100913082773499.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/1u68uho0su61bohkvag9fg3r4m/nubunepunisovoba.pdfIn PDF document text
    • http://ks-klinika.ru/ckfinder/userfiles/files/70483410011.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5c0b132cd---jubufotisojobu.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f81a030188---puzisomodisinesedapim.pdfIn PDF document text
    • https://jck.ro/userfiles/file/62811775605.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/tilamefivamudij.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161461ec9da435---tarutatulemunoxuneke.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/41081292931.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615f0fc3e3f6b---pixiwegesefazuzamagikeda.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/61390518544.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/23720102020.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/23388996774.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/pavezan.pdfIn PDF document text
    • http://c-six.it/userfiles/files/kemozorekeneti.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109201413302770.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/44649859186.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_off0000db93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB93 10264 bytes
SHA-256: 25bae4f9038875489c88dbfb2af5e1b3b595f02aadcb4009807be72d7f05fd3b
font_01_sfnt_off0000f2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE4 18600 bytes
SHA-256: fea6d29552baee1916bff3302533c9b0b32e6b6d3762dc2c4eeede8c2b6a0c89

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