Malicious PDF — malware analysis report

Static analysis result for SHA-256 b42eb65561e3a22f…

MALICIOUS

PDF

68.9 KB Created: 2021-09-24 16:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 970cc23a0938f33f3fb15ddc33d9aca6 SHA-1: 47e3ed7d63ac027a56224e02ec3561de3350e7df SHA-256: b42eb65561e3a22f7f884f3ec47027ddcd1400e384ab8a529c0a3d137bf90b69
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 ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised WordPress sites. The presence of these links suggests an attempt to lure users to potentially malicious websites for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=best+android+equalizer+app
    • http://canavesiobruno-architetti.it/userfiles/files/33178605402.pdf
    • https://acconpriti.com/ckfinder/userfiles/files/61021006822.pdf
    • https://pinkrali.com/calisma2/files/uploads/43294338628.pdf
    • https://strechybenesov.cz/content/kebujogapebadunajoli.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16142578cbe251---9024848481.pdf
    • http://minhquoc.vn/ckfinder/userfiles/files/98370467489.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161483237c3bdc---40424681293.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612eca71c37c9---17950811534.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d8caeb444---lilajemajadebuwoxe.pdf
    • http://cyclad.org/UserFiles/file/warusikosebebip.pdf
    • https://deltarents.com/upload/ckfinder/files/zisiwuzimivejajelazumu.pdf
    • https://www.esfa.bg/root/ckfinder/userfiles/files/86911262361.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145fed26ec63.pdf
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210907110226.pdf
    • http://kelvista.lt/images/files/35600764368.pdf
    • http://fotosvatba.net/userfiles/file/ziduzakesalotemotirikedul.pdf
    • http://llux.vn/uploads/files/girasipono.pdf
    • http://plncse.hu/php_data/file/zovun.pdf
    • http://realcomfort.ru/content/upload/file/zutevulunule.pdf
    • https://aymexco.eu/ckfinder/userfiles/files/96692764623.pdf
    • http://sxsasa.org/images_fck/file/1630569284.pdf
    • https://renault-service.com/userfiles/75904454342.pdf
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/buzewemibewebigib.pdf
    • http://aolisenjiancai.com/data/files/70393711861.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b059.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB059 16792 bytes
font_01_sfnt_off0000c86b.bin
e6694df486bfd5dbb865fe489d91c7c1e0f9c782a0ffc8dd8325b0061ade107d
pdf-font-stream PDF embedded font (sfnt) at offset 0xC86B 15080 bytes
font_02_sfnt_off0000edbb.bin
40378f375a29feb029ed50874ab44ce71dce98aa72b55967d73e5878ff5e169e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBB 10744 bytes