Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb65ab76086cc0bc…

MALICIOUS

PDF

100.7 KB Created: 2021-07-03 06:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33f0d285c765b3bf6875815a46086e65 SHA-1: fb070eb09cdbce93448ef6ea59fff82f84e5f213 SHA-256: bb65ab76086cc0bc4fa6c1724db49d63a9fff9b347e03502f6204b89862e5511
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to potentially malicious PDFs hosted on compromised WordPress sites and disposable domains. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808af634137---71739659440.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/ba7bedadf6bf12682dd90c2845f52d1a/47659762749.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a01e70e014---birar.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/9ddea4g4unvehpn3irihmhmq0c/vitigix.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd9db68a54---58592514451.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608927151f27b---8342552800.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070fd15e3227---60969465383.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16082ccd47dcf9---42365207909.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/bbf6e462fb8899ea1eb7e7f268d604a6/13989671130.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/25d19234bf678d854b2e2f8361a984c8/7174828646.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dbe184fa8---58434878706.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/65347inqjqtv5hsgm5941s2uvu/94069686260.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607a49f475abf---29699808892.pdf
    • http://alarcon-v.com/editor_upload_image/file/59124125156.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/vg8vu5o6df134auvp61jbuqshj/54200426901.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073fe338b3fb---67617617686.pdf
    • http://cgpreceptor.com/ckfinder/userfiles/files/widegapewuwe.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ff6b91ac5---gotobigik.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/a67d2d824ba22bcfe79a8f9e62fe9638/bokepiloritaxe.pdf
    • https://baoholaodong24.com/userfiles/file/96447393965.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1608131e5365f0---9110656289.pdf
    • https://avenue102.com/uploads/file/kuvumatefonobut.pdf
    • https://confetti-seasons.ru/upload/files/zanazowi.pdf
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/0hah11n52ujdig265fpgt753uq/61890631829.pdf
    • https://kurek-rowery.pl/user_pict/file/8972947.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/55974fae0fbe66b6c6d71cec7e959bdd/pazewip.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+get+your+shoes+to+stop+squeaking
    • 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_off0001273f.bin
9b2e1b58ef7d3808c8d19987334c365e57a761b9730869ffd1ad550f58affc1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1273F 17220 bytes
font_01_sfnt_off000153dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x153DD 16792 bytes
font_02_sfnt_off00016bf4.bin
341acf86c9649f17460d3541b3b9a233f9cefc174c41511e481e89467246fd18
pdf-font-stream PDF embedded font (sfnt) at offset 0x16BF4 11012 bytes