Malicious PDF — malware analysis report

Static analysis result for SHA-256 b64a71f6ad3fa430…

MALICIOUS

PDF

83.4 KB Created: 2021-09-21 21:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c8857f5ce13c7942bd0772adcd5ece6 SHA-1: 2f422bd25c9a0429eedce3cfa277477318d0f2ba SHA-256: b64a71f6ad3fa430571ab6200647960c2f732a3a867135e892c06e981de354ba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised WordPress uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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
  • 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://jmtours.co/aym_image/files/vozukefipir.pdf
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/kixixu.pdf
    • https://highrise.pl/file/68753294283.pdf
    • http://cancercareresearch.com/userfiles/file/71634826880.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/fb3404af3b6055c2b0365c55991465a6/88048156157.pdf
    • http://workontext.ru/media/file/gawib.pdf
    • http://szerecsengyogyszertar.hu/editor_up/mikusanijovurufovekux.pdf
    • http://n3ss.ro/ckfinder/userfiles/files/mamibaru.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138423a49940---94881969383.pdf
    • http://ibb-online.ru/f/file/51078192602.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/34f1aaf24ac5210bb80049c12c5f7115/labiwevabefumowefijozesi.pdf
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/buterowofedobodosel.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161371a0d53095---wotavujik.pdf
    • http://gramercy-grand.ru/files/file/rinuvefezimo.pdf
    • http://ecohost.ru/pics/images/file/13713944047.pdf
    • http://trips-in.com/ckupload/files/xipetibuzodutawaroremod.pdf
    • https://giritrademark.com/content_files/files/5335108328.pdf
    • http://righetti-ticozzi.it/userfiles/files/51446678465.pdf
    • http://agierresrl.it/userfiles/files/dunuguwewajitez.pdf
    • https://majubesar.net/contents/files/betaxedikerajotife.pdf
    • http://pazzo.jp/js/upload/files/7515922501.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8b2712c11---56850047965.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614070fe93b8f---gejeduvinowuxewofilulipur.pdf
    • https://global-brand.net/userfiles/files/wevaja.pdf
    • https://alicantea.centralcms.cloud/galeria/files/10457701137.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+transfer+files+from+android+to+android+via+usb
    • 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_off0000e0de.bin
a2d2d221fc271b45b6e21238e66e3de7ed0fbf6b5233fe42cf501adccf4c459b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DE 10896 bytes
font_01_sfnt_off0000fa16.bin
fcc6fa522d4a6d903768e39f3d5c738d824e9262803b83b333f6e99c3d360083
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA16 17664 bytes
font_02_sfnt_off00012758.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12758 16792 bytes