Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54d7c4ddcf90387…

MALICIOUS

PDF

91.9 KB Created: 2021-07-14 07:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ca936e27d0f1e804f828eac3fc7738d1 SHA-1: d0207644fdc7e8c4d8b43763ff21926d58bcda04 SHA-256: d54d7c4ddcf90387ef9ffe3c01c21ef2764acdabf3ca34a8bcd5f99dc4ec3fa8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious redirection techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://al-farh-iq.com/upload/userfiles/file/40037297646.pdf In PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa771043eea---jaxeganonegud.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/hve5l2nemaqpfjurkhp8peefk9/raxukegavusujemukabisax.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/76044613454.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d24496894d---nasujimi.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/fovobixa.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/75436acec0df942466d2af8a1114a14d/pufulaxabimetunapinokoxed.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160ac48b496920---vixudejipoluxopunes.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/23688061893.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/f5159434d82776ccf8d30921aa1723f1/33665255815.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609842fe5c5f1---gepinafewutozumelalaniz.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/10470259215.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/c6d81d8052b2bad2af984d15d1f997dd/70678403947.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/hbhl8sqdan18polt75htvsog89/91676018623.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/46048283162.pdfIn PDF document text
    • https://flyags.com/editorResources/file///bupevifurebefugujisa.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7834495e73---89525173268.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/48200289403.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/tuzutozuromuwoga.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bfff452bf6f---11969287439.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/f7b0931414f6a51df7550d02309218c0/89465290221.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///11369739018.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/g0nfiopohu34ommmoseg9sm0u6/77211766342.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/b9d810bd3c3e9f8b6c156365831ecbe1/97150451257.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=justice+and+revenge+quotesPDF 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_off000105bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BC 17108 bytes
SHA-256: edf6ca832c157f14852fa60741045ccf12517d8c9643441cd23f52042746c718
font_01_sfnt_off000131db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000149f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149F2 10800 bytes
SHA-256: a7159bebd04ae0f7ffcaf39c494e523a3b49f7fda8075ff6139d8f650e048cc4