Malicious PDF — malware analysis report

Static analysis result for SHA-256 505ec940da3c38e7…

MALICIOUS

PDF

84.1 KB Created: 2021-09-18 16:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 164ec028ad8dd8b93e69c30c10892da1 SHA-1: 043c25da0ca8e56b41a3768aafa88d089cad64ca SHA-256: 505ec940da3c38e72d0825d5a75b5c9463dea76fba29749009612f622d6daba3
204 Risk Score

Malware Insights

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

The PDF document contains multiple heuristics indicating malicious intent, including a remote support lure and links to compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest this is a malicious PDF, likely a phishing or trojan delivery mechanism. The presence of numerous embedded URLs points towards a link farm designed to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://irlanc.ru/uplcv?utm_term=lg+nexus+5x+firmware
    • http://villkasz.hu/editor_up/gexosixazunorogonajukema.pdf
    • http://finchamauto.com/pics/10932622294.pdf
    • http://gintaras.cz/userfiles/file/xevilixobamanerolux.pdf
    • http://honyi.tw/ckfinder/userfiles/file/nedodawedokor.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138129d4f5b4---15196486147.pdf
    • http://librojuridico.com/aym_images/files/sujomibox.pdf
    • https://techson-cctv.com/upload/file/12567145735.pdf
    • http://sgrappresentanze.eu/userfiles/files/5154271359.pdf
    • http://arabic.cz/ckfinder/userfiles/files/nefoketidovajumed.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340c0a6858e---32868595217.pdf
    • https://agrocare.ro/ckfinder/userfiles/files/74448841022.pdf
    • http://thuonghieutoancau.vn/uploads/files/debidiwepodovibera.pdf
    • https://tezerwatch.com/file/upload/files/09-08-17-49-34-10.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/uei46hfet79bbke77jnr7kg0nd/gejamapalifovuwi.pdf
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/kemazovadunuketogofizif.pdf
    • http://findingthegrey.com/userfiles/file/10932677364.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/19ef8648df3da9b03f3d006b8f0131c8/pifubanomuvutaro.pdf
    • http://woodlandhills.ilovepokebar.com/uploads/files/84442934877.pdf
    • http://fourfoods.com/images/files/xadidakusitijotas.pdf
    • http://jiachuankeji.com/upload_fck/file/2021-9-16/20210916123739695053.pdf
    • http://omegapizza.net/uploads/files/lanagalixavevakip.pdf
    • https://aristi-trap.com/upload/users/files/36006854403.pdf
    • http://caogenzhiben.com/filespath/files/20210904231803.pdf
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/supijewo.pdf
    • http://ifaistos.reality.gr/~triantaf/images/file/gamoku.pdf
    • http://proallprint.com/userfiles/files/14270125462.pdf
    • 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_off0000e215.bin
fcdb521ffb4dad409e1f6526375ae71e632eed2de9252b53f376c45f618c96de
pdf-font-stream PDF embedded font (sfnt) at offset 0xE215 10672 bytes
font_01_sfnt_off0000faa3.bin
a9f27e39c9bbf1219c3a75796377aa050c9ff33f70734ea726589ca4645c4217
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA3 18028 bytes
font_02_sfnt_off00012a92.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A92 16792 bytes