Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddafcbda203a8a1f…

MALICIOUS

PDF

84.1 KB Created: 2021-09-08 05:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b16666be1a991cd1823efb78f38ebe81 SHA-1: d4119d8ff4866f2175724209b9ba13fe3afd3dfe SHA-256: ddafcbda203a8a1fb9709adfe899f596e1fa1209e3bdb79edae89ee534de6042
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pistant.ru/uplcv?utm_term=vedic+maths+tricks+for+square+root+pdf PDF link annotation
    • http://mosjob.ru/images/file/xelov.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f064ae0974---29479191829.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc9c08d9c7---93774445701.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ef7a8de26---56601444205.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/i6mtmfpgpra24k46cmk9mbs3jr/loginojedeza.pdfIn PDF document text
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/subagimutizo.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/rif48okp8esbrdkk42thfj2bp1/87458286324.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/kiwufuduxonijebizowaw.pdfIn PDF document text
    • http://vejwun.cz/images/nukisisi.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dac20118c97---tirulubajovotu.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/zetifonoseleg.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202195123240.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e9fc14557---zozimutamufumedon.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/qm2barklfc3dr86rb0mce1gs87/94757250892.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d0c2e957e---bozomudiregivuveko.pdfIn PDF document text
    • http://come2menorca.com/images/file/16414364900.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/jusufugepazupogu.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/daea92af44e8de31961013224dd8769c/2171492663.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///53270652107.pdfIn PDF document text
    • https://birotex.rs/images/files/65217500734.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a448e0ddb---94175607404.pdfIn PDF document text
    • http://daikinhbac.com/upload/files/vikum.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/tagonuzebawozibubozofod.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/ubj1lq37lkpnalfbvmfcg67a27/81037952857.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607756cbc8acd---68038570584.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_off0000e2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB4 18024 bytes
SHA-256: 4acb9a8c2e6eb3349d60c8fb9725c48dfd90b866e6a08dc2474f5b7b5e28b856
font_02_sfnt_off00012939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12939 11040 bytes
SHA-256: be8164fcb663fa083cbf6d75c2bd53cc4bf5b93a6b1f08f43a39e2fde51ac25e

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