Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf1f4cbf2fc0fe83…

MALICIOUS

PDF

77.2 KB Created: 2021-09-06 21:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 23b0bf01a60c3813eda9b3a07bb904b6 SHA-1: cf4afa57f8c1eb2070c04e8181ec21c78143209a SHA-256: cf1f4cbf2fc0fe8316e93ef12951cae14ee08843024a1b235bfa797acac3e9bb
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites hosting other PDF files. This structure is characteristic of a link farm, often used to obscure the true destination or to distribute phishing content. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f203ce3a16---vetexabew.pdf In PDF document text
    • http://aaykpn.com/uploads/editor/files/45325756225.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e904d490466---63469129763.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/51966773210.pdfIn PDF document text
    • http://blueyee.com/upload/file/052303171374.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/sadekavoke.pdfIn PDF document text
    • http://sanmargholidays.com/ckfinder/userfiles/files/petiramo.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/21728228928.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/37721742061.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/rigavabanovef.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/q1jv0pfvifmka02pl0vqbbiuns/70893611892.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/86863acb32a4e7a5ec68c4724ff4977f/zojizupafefajixenur.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/2395808418.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/tebolem.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a835fdbbee9---79751567881.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/no7t54macshhsrdoq2rke6tola/zurepajajametavasevipo.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/zowigerol.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1378c24538---1153138632.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/petosit.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c750c68f9f---45986856792.pdfIn PDF document text
    • http://fpole.ru/sadm_files/46190530950.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/adb982f2fd859ecba3d0aa8d0bfef7e3/fikuxigusuxapoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=antioxidant+activity+of+medicinal+plants+pdf+2015PDF link annotation
    • 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_off0000c4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AC 17648 bytes
SHA-256: b51a01ef242ba0130ce8452f35d0b7a849ddb8e58f5a57fa941d79bc4e30ff27
font_01_sfnt_off0000f299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF299 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB0 11372 bytes
SHA-256: 4d8cd27d5d447f42db498de4671a97e8ede55d3d407bd592b4d9b6345e0a62db

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