Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae802e258968fe5c…

MALICIOUS

PDF

79.6 KB Created: 2021-09-18 06:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 032ee842e0448ee01d5d6cbc23ad52b6 SHA-1: 2711d9e9155d1c576c93c3f7295036ad2836919a SHA-256: ae802e258968fe5cc7062da6b100f975707661c7c17065edc865c6d649a2b16f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, some hosted on compromised CMS upload directories. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6318

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://gogift-it.com/userfiles/files/63143960748.pdf
    • http://krukewittfarms.com/userfiles/file/29487932837.pdf
    • https://vitanov.rs/files/nirunolarazubijipokopub.pdf
    • https://binarbaidrealestate.com/public_html/userfiles/file/49994171408.pdf
    • https://sunnyvale.com/wysiwygfiles/file/tepez.pdf
    • https://santa.sg/images/users/00000000/files/70739002977.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7c74d1209---61584721531.pdf
    • http://www.tahi.hu/ckfinder/userfiles/files/biber.pdf
    • http://sushi-belovo.ru/files/30743290077.pdf
    • http://studiotecnicobonoli.com/userfiles/files/27296273205.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ccd471fd4---96160297032.pdf
    • http://bearings-home.com/userfiles/file/votodogopoponikekejevure.pdf
    • http://paglialonga.it/userfiles/files/vovamemijopasogone.pdf
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/nenusepoxepisixike.pdf
    • http://mrpennarak.com/user_file/file/33250096116.pdf
    • http://teewer.mn/ckfinder/userfiles/files/61527438990.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403bbe2c306---13253643604.pdf
    • http://yuha.be/_files/file/95870538100.pdf
    • https://europacreativaeuskadi.eu/files/galeria/files/ratok.pdf
    • http://brenna-ski.pl/userfiles/file/60007840804.pdf
    • https://fcr-fomentoconsumoerenda.com/uploads/files/28562962174.pdf
    • http://xn--h1acbpobggs.xn--p1ai/data/files/vuzifawobozabotuf.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=dhoom+3+full+movie+download+for+mobile
    • 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_off0000e574.bin
e957059a7a12e02b539b6758cc06acf0cc1193ba95071a2ae3134e44d7e95d75
pdf-font-stream PDF embedded font (sfnt) at offset 0xE574 10916 bytes
font_01_sfnt_off0000fe86.bin
a5aa92a00481188c2b84fff0d12731cd5833abdb539b4eaace207f90f2cfdc02
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE86 17224 bytes
font_02_sfnt_off00012b48.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B48 16792 bytes