Malicious PDF — malware analysis report

Static analysis result for SHA-256 b46e5ec26da26b3c…

MALICIOUS

PDF

70.6 KB Created: 2021-09-21 20:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e72715cfb5baf824fd06fa869808d446 SHA-1: 80c40e76631dd15a4b58f2487df54d6a80b0a4c5 SHA-256: b46e5ec26da26b3cf579f05bb57d45de0d365c85c7c316bbeb7c55b39860870d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS platforms. The presence of these links suggests an attempt to lure users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=beach+buggy+racing+mod+apk+free+download PDF link annotation
    • http://snieznik.pl/userfiles/file/xaxawetugukabuxufoxomuma.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210914130307381.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/56568139675.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/1e1201c46c604b03fc1cae74b73dbd49/ferenafos.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/45604384467.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/98061666473.pdfIn PDF document text
    • https://latework.cz/soubory/vuvedepaxij.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/kudiwavamolikerojudem.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/nawodaliwomuj.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210908_FF7A52CCE4D55F1E.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/86703884305.pdfIn PDF document text
    • http://elitacasa.it/images/file/virug.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210911044448.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/83a5a6e6b29dc1ae86293739c79ff973/tawokubabinebokex.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/jodizedutisirarav.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/taredesadim.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/76924051345.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/78238162806.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/17539941730.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/gunoliduvovefojidun.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/ruxolonevuko.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/ec9d05673103b764fc723296d5c64178/tumabisurapaja.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/gefovowinafefik.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/27280937261.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_off0000b24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24E 11388 bytes
SHA-256: f7b516e5a005da4f5db3e5bdef2e4114f3cc2c9a85b71875a7d70e0a72f04ec1
font_01_sfnt_off0000cc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8D 15580 bytes
SHA-256: 4e175126636a0cb3728a7fbda0b106fb395114a6b2190c2f599722b0ae5e51f9
font_02_sfnt_off0000f459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF459 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1