Malicious PDF — malware analysis report

Static analysis result for SHA-256 7786a83fbe168e2f…

MALICIOUS

PDF

72.7 KB Created: 2021-09-11 02:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: af29547f80cfececb906f7d956017691 SHA-1: 889e5f34b839d3d0e9278dc174e34c2b52b8d73d SHA-256: 7786a83fbe168e2f639638d0c3554733299df77b8e992ecbacb5a2f622bd553f
196 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to compromised CMS uploads, a common lure for phishing or malware delivery. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document likely instructs the user to install or connect to a remote support tool, a high-risk activity in unsolicited documents. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into executing remote access software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/161386db885f56---87316851292.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bea2b9447f---weboj.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/8760761782.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/54355246740.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/kewazivagonad.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/lusabewitujibez.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b924b71af0---24602623829.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/jixetixofogatoboxo.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/1c362d4dbca3eefbc65ff37c7414d7e9/39990553470.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/72rg373v7tsi5jc20ockmeh674/35538644721.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/80110701340.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/woluzu.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4bac56176---nunopilevigolupup.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161307af1a187f---92457887711.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/sitifekuwo.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/5277078789.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/zopidatubul.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sexofaraxagiretuzozu.pdfIn PDF document text
    • https://kristinanamaste.eu/files/42997487176.pdfIn PDF document text
    • http://cochemical.com/upload/files/zakaxaxaxonebofoke.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/49927868119.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/pesatafibolosubax.pdfIn PDF document text
    • http://rrarental.org/upload/file/pujinikadelemim.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/30583521134.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109041055419157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=edius+7+free+download+for+android+mobilePDF 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_off0000bd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD4B 10776 bytes
SHA-256: c25d509954611774e46f5c2c9f32c86b849184e0a6929efd486fc4b7dd29bfba
font_01_sfnt_off0000d626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD626 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE38 15352 bytes
SHA-256: e818fd820b4f83bef1098a3d78451b1634ef809d9593edf983abaca090428273