Malicious PDF — malware analysis report

Static analysis result for SHA-256 6844a43a6fd6e140…

MALICIOUS

PDF

104.5 KB Created: 2021-07-02 01:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 669706bc803a7f19d4adbf89873ceee7 SHA-1: a074af5e80f23822acfd35dd7bfe6bbef4697e4b SHA-256: 6844a43a6fd6e1401776f34f67a085e89be3306e2e5d2b779d53e8c502a627a3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting it's designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The file's structure as a link farm on potentially compromised hosting is a common tactic for distributing malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://chcial.ru/uplcv?utm_term=financial+accounting+harrison+horngren+pdf PDF link annotation
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/85577307783c6febad8c516128d3a519/sixulozejekubedoxulule.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a140a76a752---dorejajeperamudewa.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f23ea6990---75283425325.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/2e3c9a0ad79b338d22acffd4166fbfe2/tupafanodogib.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/f09bbb01a9aff8fe69f1f4a0697cb099/63959219829.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/sonazobodaruxerokelenugef.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/94407053896.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/3276637784.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/wusidekilaramisi.pdfIn PDF document text
    • http://geobrofab.com/clients/d/da/da7cd3953015cd63472398095fc1fcdd/File/69505146799.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/98543437134.pdfIn PDF document text
    • https://btegypt.com/file/82363363791.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/33556920295.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/sivivinunogunodaxakeje.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a13a2e14497---80005695897.pdfIn PDF document text
    • https://irantruck.ir/data/file/93985848265.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/3349c0bd690e705121ecd32d133774c5/82421073980.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c486208f3---36900745839.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b9263ab9f---teletonejavotobe.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/lunowiwiwugovatifasu.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/9167f94bd76eeb4b8d3ec222b236fd8f/nipesoz.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/68080318569bfdaedacf1d1e0d3c0c7e/81985859870.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071d69b2beb7---dajefadarolupevujupu.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_off000132e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AF6 18760 bytes
SHA-256: ee0a4b91437cd18e298089ad6c006394a4a816a246e971b687a24ddc16ef9f97
font_02_sfnt_off00017b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B4B 10976 bytes
SHA-256: 81729796ab7471b588a08bbfb0579f6fdd75db6aa10320a3ebb3845a5d4b601c

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