Malicious PDF — malware analysis report

Static analysis result for SHA-256 6564ed99d2c4c4f1…

MALICIOUS

PDF

85.4 KB Created: 2021-08-17 23:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f4b315ff49c43640c9bdfce47cc6e242 SHA-1: 84e1060e0031e3d7bd2ac20371e09ffc88429bc7 SHA-256: 6564ed99d2c4c4f1a984a9a981778dd2c58716d631728a1dc6a50878962509d8
176 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and one directly to an IP address, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple compromised CMS upload links further supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/f2liiod4eq1k5oqe7l7mh4rnrn/60383532159.pdf In PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607058d0271c1---30505924804.pdfIn PDF document text
    • https://olterus.net/contents/files/vaxajakewuxije.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16070df5990502---45661012316.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/73202033555.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/aqlms8iho86v6itkj95ekmf5u5/katafisivulegivegofepepoz.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/ff8cc6f9d86a24778790579fbff1c476/89114031031.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/vefokedowiwadimamizetafes.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/6a0ae4e50125dfe5d92beb5b41fe45b5/90330535416.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bacc6b9466c---11756477114.pdfIn PDF document text
    • http://short-story.ru/upload/file/22158827537.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/63295132457.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/gabifede.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/v07te3jjr85nhm132rhf4729ub/zepusajelodobusirixanibez.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/gidudoxigajamuguwa.pdfPDF link annotation
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/4992198947b5acfd32cd40b9805c40eb/34616364678.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/45367547529.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/520850480dcffa5d902620ef585767fe/weworezumematerobuwik.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/47237665602.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7cdda25b7---moluvanelum.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608392331d784---32301845376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=8.4+thermodynamics+worksheet+answersPDF 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_off0000e39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39E 18332 bytes
SHA-256: 214f7c60e76c4b9b449f0ce317387997c919bb5ac64274de5f0122c18a3524fa
font_01_sfnt_off000113e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E1 11136 bytes
SHA-256: 3135e935ce43c7ebeaa8d7d024b513b2fe2586a79b58f54cc95ce9ac8b4434cf
font_02_sfnt_off00012ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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