Malicious PDF — malware analysis report

Static analysis result for SHA-256 9805152e1afc7432…

MALICIOUS

PDF

85.7 KB Created: 2021-07-04 23:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6cb1e0e221ae9995c67a2ac70be46c9f SHA-1: e02700d4c22636c705fa42644c8de5b69a957dcf SHA-256: 9805152e1afc74321dc78f4b322762a54db8e7e94f0ff4553e2b82235d0c8288
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm with numerous URLs pointing to potentially compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate a strategy to manipulate search engine results for increased visibility of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/fdmhp1ltakdeu3s9fut185sh35/tadowa.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/vp75ka4f07si27fihs5iqrmo53/35823272627.pdf
    • http://afgventuregroup.com/cfiles/file/gupefolarero.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092960cd40b1---nisir.pdf
    • http://beijingxinzhi.com/userfiles/file/20210703073520_1669766179.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/dmi1r7q9larrf1vof8m9eaitvs/lusuretifinegowere.pdf
    • https://tezerwatch.com/file/upload/files/06-22-13-30-11-91.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8591b947b---lapetavekuviwodo.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095371fe41eb---fibokovitajug.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/9ce42788d75bbe739914f594b9cad2ee/22770923028.pdf
    • http://luingpyrex.cz/foto/Image/file/rusisemuxufumabidaz.pdf
    • http://ellenia3.eu/userfiles/files/29787160838.pdf
    • http://sacoorhealth.pt/site/upload/file/pobakipefofifukitepob.pdf
    • http://shinies.ru/img/lib/file/20619107172.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcf01006cb---61530157441.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1defba3cc1---wexadusivupilu.pdf
    • https://aawyx.com/sites/default/imageuser/file/bejanegab.pdf
    • http://aodaibooking.com/FileData/ckfinder/files/20210609_AC0F1FD72E8DC5CC.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d237d9b5fed---55963730071.pdf
    • https://anfauglir.com/images/file/sijiwu.pdf
    • https://247hvac.ca/fabulous1/uploads/files/lejitopuzawapiwivekufo.pdf
    • http://aivieksteslaivas.lv/userfiles/file/rivov.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d245d3eaeca---girom.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/3d51a41f55ef696974253aa2a0a02385/79758770422.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/56286ed091796cc776aef79abdeaa9f0/xuzaloramafowefibob.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+encyclopedia+of+demons+and+demonology+free+pdf+download
    • 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_off0000eb39.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB39 16792 bytes
font_01_sfnt_off00010350.bin
b3708cb618009edbe4bb606f3bf27999a549a9713635445ea7edb0f2e45fbdf1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10350 11132 bytes
font_02_sfnt_off00011ceb.bin
79f2868687fddb49b732de24be49398ef98e327ac551ab8daf0a740b75576c15
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEB 16904 bytes