Malicious PDF — malware analysis report

Static analysis result for SHA-256 843ffda8e4bc6a5f…

MALICIOUS

PDF

69.0 KB Created: 2021-09-05 01:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a45b1526edebefc4157b79c85ba78f03 SHA-1: 853dc443f8215c64da3c4fe6e47ea7f3468acf95 SHA-256: 843ffda8e4bc6a5f36d2d1c6808776efeb4ac7862a812fa3be61d78689eb81dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to phish users or redirect them to malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608723c7273e9---34708591151.pdf In PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/912329aa3b166fae787269ef605e6dd7/38621360145.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a8202a385c2---disivudega.pdfIn PDF document text
    • https://ready4use.ru/uploads/files/12474372383.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160764fa4c976d---94735953187.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/majuruxubuwalirebinanib.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/veluwamitexibuza.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d5b71b7e0---sorupuluwemowujodukelitek.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/12294931616.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/c9891c5a6f0635c55d6b6a57c95f996d/21488160791.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/37534916743.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/5965d48ec7e445a3f9c4c408f5dc7d52/18573665326.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/aebutq9tbanbnpfgl4kuiovchv/folinanudaguvojufu.pdfIn PDF document text
    • https://thaihoanghung.com/upload/files/rigileledegiwovugat.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/xepukesinajezarebuxop.pdfIn PDF document text
    • http://cocoal.com/uploads/file/xodudinipodusurizerofe.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/mawimiwuxes.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/73jjltvk2rckhgb3ag9jebj8np/gefewofevumobiz.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/81693477304.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/ca91a75aaa8570da77bf937d584b67fb/37198374989.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/nipedelutopurixopi.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/5ee426f2ce947ff3fbddd2f9d5844404/24482560792.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=unirex+n3+grease+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C3 14652 bytes
SHA-256: a344c31cb5a0c591d510d10a06949db1bbadcca4f0e5b4b47678f196afd6801e
font_01_sfnt_off0000d647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5E 10688 bytes
SHA-256: 8ad4a7ac1f72ef25fb8059a9d1c77b32842fb4e5e6e13e4f6f58ab3084a76cef

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