Malicious PDF — malware analysis report

Static analysis result for SHA-256 654fa9176b600345…

MALICIOUS

PDF

83.9 KB Created: 2021-09-17 07:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fa29a066d1ab0453a1505b4b8abd705c SHA-1: 7f3ba6f0acfeb8512718e21d48220f413a200d8e SHA-256: 654fa9176b600345cf927ea89c2927df9345394d525a0a6203be75169176ad4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware distribution or SEO poisoning campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://cructi.ru/uplcv?utm_term=how+to+connect+ps4+controller+to+android+minecraft PDF link annotation
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d941caea32---25584121020.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/fegutesom.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/78537678272.pdfIn PDF document text
    • https://jotelek.hu/files/file/tudusixolubikef.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/9974138195.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1692f15db---galikematurukubuxagar.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/21678202869.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/17870269109.pdfIn PDF document text
    • http://tulga.ru/editor/files/63451500822.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/niranedoxajojimoxepivag.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/temujuxapunor.pdfIn PDF document text
    • https://geniodelweb.com/file/20899775574.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/rokopelizobowujusurus.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/takudopopezudelobi.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/mazupujiremipinusikefajiv.pdfIn PDF document text
    • http://dsagco.com/Upload/file/xadulufemuwovumifa.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/76981097688.pdfIn PDF document text
    • http://askaudit.ru/price/29901468687.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/3q7u0mv7l9l1o1m83j67o4lsi9/80793185784.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/77398741857.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/57299474293.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/63243168271.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/57640398381.pdfIn PDF document text
    • http://rentaruedas.com/files/others/fotagusomamimikivaj.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/2a182e9ba3a1a4e2b9d0cb42c7bf581c/zugisuzatojosopazazem.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/giragubegezinazi.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_off0000df1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1F 18652 bytes
SHA-256: 22309799f5f1a7fededa64804985f2779d80c72db917bf4cc9fec1e175d6cf35
font_01_sfnt_off00010fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDF 10936 bytes
SHA-256: e1f7425a01702b2de740f5f389d8037bcf21175deee3af1dc74ae60083394b88
font_02_sfnt_off0001293f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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