Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cacabd24edd54c4…

MALICIOUS

PDF

80.6 KB Created: 2021-09-06 11:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6c1943f14571360c6279569df185d58b SHA-1: eb21df1bc598fd042b97a0a9451b3e70ea5845d1 SHA-256: 2cacabd24edd54c4a2bb6b2df04684fd2d3a594ca2b02fe36117b3ced1ee2a33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The heuristics indicate the PDF functions as a link farm, containing numerous links pointing to compromised CMS uploads and disposable hosting domains. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://top-conversion.ru/ckfinder/userfiles/files/62743036026.pdf In PDF document text
    • http://scro.ru/pic/file/famoluvozikejukufukutepux.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b29d2fd8763---mojifesinafumibepipebete.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/13870666442.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160758ae45ac1d---13434279107.pdfIn PDF document text
    • http://acril.ru/ufiles/files/80227583883.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/81703740975.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/wiwuverazonomabevuzonasa.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/20794728132.pdfIn PDF document text
    • http://ruresept.ru/files/file/4789485150.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/dekulovarad.pdfIn PDF document text
    • https://12shio2.com/contents//files/fuzoxevam.pdfIn PDF document text
    • https://paradigma.bg/uf/file/toxelibudijixijanag.pdfIn PDF document text
    • http://haphadoor.com/upload/files/xazuxivalifozivopoz.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/xuwaxuwo.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/28411686495.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/85mltp68aen4mq96d2hsomkb13/30550570378.pdfIn PDF document text
    • https://latework.cz/soubory/sebobupiva.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/51777632839.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/99163285509.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/zoxezabakabenimilitek.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/351f2a83b2723dd594f362acc36dd42b/22249768159.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/b8cd6fddef5d6883a201651985ae292b/tidarenobapubak.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a4417e8fb---49638589574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=ghatna+chakra+current+affairs+pointer+2019+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_off0000c7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E3 22376 bytes
SHA-256: d1faecb4c60110043b8c3ede5ebdcef0a80917ae1d832a806e4ad243a8920130
font_01_sfnt_off000101c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E0 11364 bytes
SHA-256: ab308bf4fc978d3f2adf3b4fb0365de70390aab0416f83e1c69cf61a61871d1f

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