Malicious PDF — malware analysis report

Static analysis result for SHA-256 f194f51a1a161857…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 09:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8707686cebec03617a6b0ac7c2bf8e25 SHA-1: 42d333c04241246c5d363b883c190bd973ce03d2 SHA-256: f194f51a1a161857b57b943cca9e15f94e857688b6538cd13a8b74bccaee0c4c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to potentially harmful content. The presence of these links suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://se-ty.com/uploads/userfiles/file/71668359327.pdf In PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a03bb243e---4387616833.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/badefesutexipur.pdfIn PDF document text
    • http://asja.ua/userfiles/file/veweto.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/guvutukeronas.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/ece8ce4739a0cc2b74dcede71e244e13/tojozisenenibikumulavezi.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/fowejebina.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/jamiweku.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/b8956a9c785a9af811e770f14928b390/60759190187.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/51082682335.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/wapipegifuw.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1630530214.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/sefararilojikusaratakit.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/tukafonurupofew.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/41235695678.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/satanufekawegowovebawisu.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210907090906.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/14637144746.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b546fb6b38---kevuvajijir.pdfIn PDF document text
    • http://praguetransfer.com/files/file/7795291713.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8bfa3f2a4---45542147758.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/10628573879.pdfIn PDF document text
    • https://rosycaffe.com/file/zixonujedenudobulogisaj.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/bafijenixiverap.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/ad9aa5d3174e26b21517d20b542c5e16/tajizijufu.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/45900955044.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+load+live+net+tv+on+firestickPDF 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_off0000dcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF503 10704 bytes
SHA-256: dd5e1faecbda0d5c96668d1f522d57fadc4ec7569519e98ea1726b68867ea846
font_02_sfnt_off00010db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB8 17704 bytes
SHA-256: c7512c0b2ee47fee3f1abeb11d62620746d08a80f0ad8cff3ec3fe043136bf0e