Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa91ad6ebca9dd9…

MALICIOUS

PDF

62.4 KB Created: 2021-09-16 01:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5745c5ab49c0a0cee36e014938930001 SHA-1: a0e430d701607da2fe524f11ac91d4a4074abfe2 SHA-256: 9aa91ad6ebca9dd98b7f2141301a82e9b364559f88f76bcda1f6b0f75583d3cb
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9121

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=golf+apps+for+android+tablets
    • http://huzatfokozo.hu/editor_up/darikabunubusefof.pdf
    • http://integrotech.pl/zdjecia/file/35253788037.pdf
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/weperejuripumogikitu.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ae986ee42---zugoj.pdf
    • http://bongoes62.dk/userfiles/file/rimewumufugomatasafafino.pdf
    • http://realfootball.gr/userfiles/file/87169356392.pdf
    • https://yifff.se/userfiles/file/82990795152.pdf
    • http://tutek.eu/userfiles/file/78540684430.pdf
    • https://tonitomov.com/picture/file/86311059249.pdf
    • http://tranhdaquydep.vn/upload/files/dadasabedipebarug.pdf
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/52412253409.pdf
    • http://nbkhjc.com/uploads/202109/file/210905194706632854yjgc29xe3hal.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7d71c4e8e---79089807910.pdf
    • http://faithleader.org/js/ckfinder/userfiles/files/9898343414.pdf
    • http://chaitraglaze.com/uploads/wajidevugelijoponi.pdf
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/rekalijuligoxavab.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16131b2567f4cd---gojepakibunafojeseninivob.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/5114487484.pdf
    • http://studiopignotti.it/userfiles/files/85070366737.pdf
    • https://stradatextiles.com/upload/ckfinder/files/pokixuritakite.pdf
    • http://windmill-bv.com/userfiles/files/rukaxuwukeluzaxukusamide.pdf
    • http://herium.net/FileData/ckfinder/files/20210907_909B2C6F12693B6A.pdf
    • https://cissud.com/uploads/ck_editor/files/sopusiduzinigebexivened.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd0f.bin
29a491ac20d9282f6910256264f2a0b984627930e66b53df19ee4b0f67d81dd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0F 16832 bytes

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