Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f45f26c3e4b7d77…

MALICIOUS

PDF

91.6 KB Created: 2021-07-30 10:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 92c8a919ee0b6e7fa5420d560e63c8f9 SHA-1: e4d17f7dde82154aaa366bbfab3f2217eb46bb92 SHA-256: 4f45f26c3e4b7d772b9f98e8920f9bd4e27bd69ff06389acd0a4fa738e1002d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories and disposable hosting. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://laborke.ru/uplcv?utm_term=what+is+an+empathic+person PDF link annotation
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/6b09c1600ddd5eacc8cbc8b5836cd032/69857310276.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/71043128972.pdfIn PDF document text
    • https://cecprint.com/images/file/minikidozunowimevomusadew.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a5caabd8fb01af16c9b1fe146552047d/kiwatipim.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/d3283701c72ce7813e6ee622cafef50b/wikonexapixa.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7936a5b37---fufifageni.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/vironevo.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/pozivusomo.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949d9227eb3---22791137801.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/11440042568.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/jorowesiduforen.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/031451142760.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55311ae0fd---9671831841.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/541b1734fa820801bd913762b35ba3ae/rires.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/66484701176.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/22db10c5b0fe846742c02aea3fb07734/5910577949.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b0edb59c5---27854241264.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/59160889743.pdfIn PDF document text
    • http://emmanuelmissionarybaptist.com/clients/74938/File/56689599970.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c52d471725d---96801515620.pdfIn PDF document text
    • https://tdfstore.it/file/93503298336.pdfIn PDF document text
    • http://billsky.ee/files/file/gibavisotesogawimefanojon.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a2cdc93b7---88089299538.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1608fe5ca62741---23339556317.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/2c4a4fcf1e4fe57e2d70e4bf755d1c51/28335831644.pdfIn PDF document text
    • http://compsult.net/userfiles/file/24912010553.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_off0001052f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D41 16380 bytes
SHA-256: a1649f443be150781aaafa6dca28e8d529da2edcc446d21a68d87794fbe95e4c
font_02_sfnt_off000147a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147A3 10584 bytes
SHA-256: 2c5b7f2ed2dc12caa28b60484aef043dac8e50f28456f0541d2d9d0d4e745f8d

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