Malicious PDF — malware analysis report

Static analysis result for SHA-256 c86a274f688eaf22…

MALICIOUS

PDF

125.4 KB Created: 2021-06-28 09:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3531c8f053ae5c9877f2ac057d633473 SHA-1: 700a5bf4a6e4d5ec3fd0fca5aca2da38610442d1 SHA-256: c86a274f688eaf225b114dbc2f119a7f21289a53d76c7b867774f2aec47323cd
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9878

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.
  • 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://oishisushigd.com/uploads/files/limenuvizowuwadore.pdf
    • https://bakwanudang.com/contents//files/68311189796.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/70db836b31300868873c0ffce17e0d28/wajubaro.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/9paeiajah5t39mih6cko7pn6k5/jajobonarazevuzusizojo.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/7ba80b53d70444b6b7c2867a7c0b1af0/kiviraxejiroxape.pdf
    • http://aircond.md/upload_fck/file/30175550928.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/af7981192fc79c6a3419553702f2f729/jaserog.pdf
    • https://bestcoloringpages.com/userfiles/file/reromiwesubafudobipuzo.pdf
    • http://files.ibiza-ferien.de/file/9234761370.pdf
    • https://giridhareye.org/ckfinder/userfiles/files/dekomurig.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/d340b1d99a353df0f1f3a1e633bfcd48/4814956349.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c54680e5c6f---68350179125.pdf
    • http://www.gesas.it/media/mailinglist/file/11184543831.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1993e0644---zevedevotujom.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608a83e0c56a1---ruxevup.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b4593746e---pajixubipox.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc0abb5c9a---63764788955.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ed49ef124---famoluzawezerilu.pdf
    • https://mangonebike.com/uploads/file/relujinoka.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8e6649fa2---butomegaduganekubobox.pdf
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/85734291281.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608268a7ab210---80851807900.pdf
    • http://akapacha.com/userfiles/file/dawufonezibuvime.pdf
    • http://bluecars.pl/userfiles/file/belovu.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff0e5754d6---58995100393.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/c64790ee9fed48b28492c83f98bd665e/kezusinulome.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=diplomatic+theory+of+international+relations+pdf
    • 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_off0001880f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1880F 16792 bytes
font_01_sfnt_off0001a026.bin
94a5bc8f478019bf4d36410b7b5988205b96dae4b89c83102d6f8faa155f2201
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A026 11000 bytes
font_02_sfnt_off0001b98c.bin
219a7760ad14fdd6da1c67dcbbc34f351824911612a99e93172a6bc6898cb8f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B98C 18452 bytes