Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b3db6c8feafc267…

MALICIOUS

PDF

89.6 KB Created: 2021-08-13 15:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a5d59ce71f6a52ccdc2a62773115dc22 SHA-1: 6c525d91366b7d8926e6b402635936677d76e137 SHA-256: 2b3db6c8feafc2675ca033c8db391b99903c61898b24988d01db8a650bd7d500
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of external URIs and link farms indicates an attempt to lead users to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fe9432f2c---dufagedu.pdf In PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4ca92e268---suxuvimupofizeful.pdfIn PDF document text
    • http://remobudostol.pl/pliki/kitozarukamabowipurika.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/mijesazakajakakidifosedok.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b493598b6f---70152744645.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2dadea3cf01606329d5d431212da6ca1/buliw.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/latolojexetuvuwufil.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/28376237372.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a194d10e8e9---risarixujovariveteped.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210607_EA907E4C0A58250D.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/magurubujesafiseken.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b3012401fac---66342572065.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/6be3b16f8ce9641e6fdfd2378b51609e/magugebanexifovujulogomi.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/dsg2309ssrssq9va4lest7d609/98776627217.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/39451968925.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/pirefex.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/e3f32d9ea5dbf0e823e70938238801c3/43097610900.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/0csn0vqcj20ncuvfc7n6r8nrc6/5428947760.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/c0a671dc13255b1e1000dad035b4abb2/rafuzadaduwin.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/66830895407.pdfIn PDF document text
    • https://asi-filter.pl/files/file/50131995534.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/qudtsue5idg24aedo8oukgjls7/99944076100.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/90373728969.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/53343849570.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=job+search+skills+pdfPDF 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_off0000fa91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA91 17340 bytes
SHA-256: d21ffc9359638fc5807b6d2988b17d8b9bfe66a4ffafdd6107cfc5a856aba83b
font_01_sfnt_off0001274b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F62 10736 bytes
SHA-256: 6f1328c6a6dc56c138181973c69e108f9cdde8404763ec9a39a6c35945a3b625

Open this report in the interactive analyzer, or submit your own file for analysis.