Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc188de92d78a9b0…

MALICIOUS

PDF

87.4 KB Created: 2021-07-24 21:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84f3b8c166bd6fc66f6d3ff02e6294f6 SHA-1: 330a85614c520492eb953b66ce65d067d835dbb3 SHA-256: cc188de92d78a9b0a8cf93d4fe1567257b123d14f440d3e955a4737e92abe425
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of multiple links pointing to compromised WordPress uploads and disposable hosting, combined with the ML classifier and ClamAV detection, strongly indicates a malicious intent to distribute further payloads or conduct phishing. The embedded JavaScript likely facilitates the execution of these actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a71769b0efe---27712161069.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a9d54c9aca3---zijajawuloguxaposizu.pdf
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/sizotinewimaje.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/66rjddmkq6taittd2ti2nbb4ed/38207524170.pdf
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/27052755489.pdf
    • https://k-barrierfree.com/FileData/ckfinder/files/20210704_09513BE5E7416CB2.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/u681p6u10ckodv2i1d33amo9m4/kexosogix.pdf
    • http://www.donboscovizag.org/images/files/fegegenideliwopedek.pdf
    • http://metrokentakifinan.com/resimler/files/54128335624.pdf
    • http://archi1919.com/smlclub-files/file/54639731675.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38efb9dfb8---79766833592.pdf
    • https://belhasasecurity.com/userfiles/file/60423285901.pdf
    • http://kme-kme.cz/files/file/31352360724.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/b07dcca38fa61edc64b1ccf085b87cea/35902470160.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/39424949922.pdf
    • http://gostinica-domodedovo.ru/files/bofexa.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/xemafuxivaf.pdf
    • http://cbcom.eu/ressource/site-image/files/lajiramu.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/quj34pgf05hvfd1f2d0t2v6vc3/7378069340.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=asphalt+9+legends+cheats+ios
    • 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_off0000f3c5.bin
c9e34ee69e436813716f774e3f2d31df3cbc2fe2de0df6327e54f69fa442a0e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C5 16892 bytes
font_01_sfnt_off00011fcc.bin
12a2976405da4c025c6dbc1ba153bdb546a114ac286f929b8668274a67a45353
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCC 10840 bytes
font_02_sfnt_off0001389c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1389C 16792 bytes