Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bfc4ca4d74707c5…

MALICIOUS

PDF

70.2 KB Created: 2021-10-03 02:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7e0d9bbf6e3e54dda4ec8c55652b66c SHA-1: a0a1d4dd134e0e40a3aefd9d3e56390371fd4362 SHA-256: 7bfc4ca4d74707c5ce46c6ecef6e2ad4d08df606eb2ad2ceec07ca37ae3f5a36
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, and the document body was unreadable, limiting the analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329af4c6105---vomowobefifutuvavuzojit.pdf
    • https://simplehome.ro/ckfinder/userfiles/files/fetixixivivovedi.pdf
    • http://salsainkonstanz.de/media/files/pakiwo.pdf
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/gelimabodusojedu.pdf
    • https://fontan-montag.ru/img/upload/dadimamozetogesuramasapi.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614e3e230aea8---tawoduw.pdf
    • http://hcvitamin.com/webroot/img/files/mokemifojotodevudulonada.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/e9b75070566ce24c4c4bbf61ad138296/10663301440.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pjp4ridltcalv28c5u56vjr5d6/28557733320.pdf
    • http://erpos.sk/data/files/73006336236.pdf
    • https://turkuazhost.com/calisma2/files/uploads/rusumodifiwotibazuluzulo.pdf
    • http://373113.linker.tw/files/roveluti.pdf
    • http://atem.sciara.eu/public/upload/file/guzatotu.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16143a6bf41550---fakusefivemotuzale.pdf
    • http://vertracapital.com/uploads/files/soraze.pdf
    • http://chafewyuok.handysociality.com/upload/files/68295565504.pdf
    • http://nage-z.com/ckfinder/userfiles/files/36738717067.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/c6408e82e0040f03209e5dc8d47b3555/41387651912.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/c0a5359cf4894f3443bf3f868adcb6a7/9119850886.pdf
    • http://rc-modeller.se/images/file///bugenilew.pdf
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/40100260381.pdf
    • https://am-system.eu/ckfinder/userfiles/files/38731370399.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/eed831b637d4eb942b3460c8423cf5ef/wabotomugifikadalavozige.pdf
    • http://www.tiande-global.com/ckfinder/userfiles/files/guvemavatirom.pdf
    • https://lawrenceyezersky.com/userfiles/file/refejinovoleviv.pdf
    • http://tbeaindia.com/userfiles/file/88910927416.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=extinction+in+psychology+definition
    • 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_off0000b348.bin
49444fd874fab315d6ebe26d699599750a446a633e31903c3f72c9ce422e1df7
pdf-font-stream PDF embedded font (sfnt) at offset 0xB348 15408 bytes
font_01_sfnt_off0000da04.bin
3699dca2c7622fa43439ca9a9b1a288be6737e19bd947d7b08fc465b8a8c9959
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA04 10836 bytes
font_02_sfnt_off0000f2c9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C9 16792 bytes