Malicious PDF — malware analysis report

Static analysis result for SHA-256 186fceaa3f154eb9…

MALICIOUS

PDF

73.4 KB Created: 2021-09-22 14:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c8ec732306ea91c035cc938437eac6a1 SHA-1: 4d4aa4092a2d851ca9e2bb46a81a51c7525eb00c SHA-256: 186fceaa3f154eb9d38e2af6a4d2f7e06cd8f87770a874500752447a9f1cb7b6
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised WordPress sites and other disposable hosting. The presence of external URIs and a link farm structure suggests an attempt to lure users to external resources, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4113

Heuristics 5

  • 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
  • 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://crewmak.ru/uplcv?utm_term=how+to+hack+someone+in+discord
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b18120d85e---59601246241.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613554f792716---zidiranawofavegesawiloma.pdf
    • http://screen.by/images/file/winajapitarewakigajubonat.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142240bb1b0b---13452861019.pdf
    • http://curewelldiabetes.com/userfiles/file/70755850966.pdf
    • http://nfrostov.ru/upload/files/mofetagatifumudonosovij.pdf
    • http://tradotel-riviera.com/file/xizijawovabu.pdf
    • http://mygotour.com/FileData/ckfinder/files/20210901_255FA096858670A3.pdf
    • http://vigen12.com/userfiles/file/11388073936.pdf
    • http://motopujcovnateplice.cz/userfiles/file/munosidulobibored.pdf
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/wajotemo.pdf
    • http://dotacjedlaoze.pl/userfiles/file/98007312287.pdf
    • http://teraval.cz/res/file/vularemunibuboveda.pdf
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/87451806723.pdf
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/zazelilijegiko.pdf
    • http://pc-driver.ru/userfiles/files/89055598529.pdf
    • http://zenkatsu.dk/files/46672023232.pdf
    • https://ewt.cz/res/file/sobexijulafemawe.pdf
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/123550848.pdf
    • http://limobebe.com/userfiles/files/70214846758.pdf
    • http://qhchemicalsfeed.com/upload/files/vobevi.pdf
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/89721423986.pdf
    • http://kovospm.cz/fotky/file/70614742356.pdf
    • http://lahma.pl/_u/userfiles/file/mumok.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc03.bin
9ea3bf2bcefb9ac3c07573863aaf3b94ebdf8918c23c7a868e43667cbfca160d
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC03 18624 bytes
font_01_sfnt_off00010c3e.bin
4b95bb57ce0b529b7fe858a6f5c0f9b09ec3876149d7b97968be81c400b4cc79
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3E 10756 bytes