Malicious PDF — malware analysis report

Static analysis result for SHA-256 72f9758804372236…

MALICIOUS

PDF

86.2 KB Created: 2021-06-26 07:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e31f0c3206556b336c9fe0a673ca1073 SHA-1: 59fa041ddeb7c190ce77057fb994641b67e79f1c SHA-256: 72f97588043722369811acad10d355e47ccb54b43f14dbf173488306d3a87507
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, likely intended to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of multiple links on compromised CMS upload storage reinforces the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd36940fd57---radozapudadiguwuzu.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7230b14c46b1b1168dbbeb60347487de/sutinezigigoxilibidibulo.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/a40175072e20c65cd872150d824bad5f/45454319289.pdf
    • http://timebank.ru/sites/default/files/photos/pagefile/wemevikub.pdf
    • http://berbun.com/user_img/file/65752287514.pdf
    • https://oilbasaro.com/web/images/ckfinder/files/20210623210303.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/5cc41264f592affd18502c25d76aae0b/kaxezotijupovap.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/04jqicnppe79ffnn3m12mvrpf2/xamodadekovebo.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dbab11920---tubesabalabuposoju.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928e6f9b3a9---48645340044.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160993cfe25026---rumusemapasitifutipa.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb5e1ae224---33659146569.pdf
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/b22906dae6ca3ec15b6f8a9348064bc2/denovigefapiguded.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df78e3119a---29964336107.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c704f234---lodukivowedig.pdf
    • https://lensprovn.com/ckfinder/userfiles/files/55403134230.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/36642f3a0e69fb9066767064c19eeb4e/54415922067.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/qmdhetnelrvc9kfd8sseprjofa/bedufomizonunubeda.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/fb1939fae112664b8a2776b2bb845c28/40374837264.pdf
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/96348530762.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/d1d69aab3ffbc2f12f1c2cddf9a4c568/31883513249.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54b18d44bc---65538603719.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea26548760---21884233866.pdf
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/270a56ad7b7e3f403af3b8f1d9fb67da/lufabitusekebozinepar.pdf
    • https://horizontire.com/userfiles/file/32116350049.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=top+10+best+jobs+with+high+salary
    • 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_off0000ec0f.bin
0e27242c9f39640a68fa547669ee6c8172b461b53c88fdc58ce4d8b8f649e54e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0F 11036 bytes
font_01_sfnt_off000105b9.bin
559e369743386755a187e01556ace65e606d9479da95d56b9cb42efaac15a64a
pdf-font-stream PDF embedded font (sfnt) at offset 0x105B9 17308 bytes
font_02_sfnt_off0001330c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1330C 16792 bytes