Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c12abd0b98b8ad…

MALICIOUS

PDF

91.7 KB Created: 2021-08-06 06:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5a96301227da22ea60d0953d1c5c907b SHA-1: 74c67fd8e6445d30d4ba35262cb1759578207e67 SHA-256: f1c12abd0b98b8adddf5ec2f0ff058ca15d0c40de0fc4feb9ca6c44c997ef1d6
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable domains, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://synerhu.ru/uplcv?utm_term=how+to+set+up+stealth+600+xbox+one PDF link annotation
    • http://yuanyoujie.vip/userfiles/file/tuvug.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/98980154995.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096dbb5e942f---11162295949.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/31114310102.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/55690271090.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/fa84c88ed4207f86e2f018014d40d30b/97381405643.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/gm1ugdhue45qu88nlefbdk8f5g/81700554447.pdfIn PDF document text
    • http://coinmarketsuite.com/ckfinder/userfiles/files/xufugabekufive.pdfIn PDF document text
    • http://heizler.hu/files/file/30050010125.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1610b00cb8b0d4---biborenib.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084d4ff7f91a---dulenetonakezipabi.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/lagaxetoxuwonixajoteto.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/0079ed2db2fdcc8076ff535dec6c5ad5/xolinifukodo.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/tuvafosojikezamuwegotaket.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e8dbbd2ac---42752205305.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/89206787546.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/vivokolonijetifof.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/lke06dtlrmept7jib2mlbdv2dg/dofutameja.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/jazive.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/42510162585.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a119846f022---dapufejuxexola.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/12b4194483f4ebb5d725d0d0e478d3b6/39048495902.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/bf757902e6c2fb0136e653928c2e2982/78581173174.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/8174142852.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/walabunaverat.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_off00010060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10060 17928 bytes
SHA-256: 5dbf5105194a6c50b768c61b4fd748ce866011d87e12a25cd12bfbd4c3a94a1d
font_01_sfnt_off00012f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001479b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1479B 10868 bytes
SHA-256: f4dc8df85c018d456509cd6f484c273fb59229ddd99043703c83146c81a5b3da

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