Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ffd592db7b8d91c…

MALICIOUS

PDF

87.5 KB Created: 2021-07-30 12:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f0eff6261ee47c71e643ff9a70a53126 SHA-1: 6aa9433e1040a22824ba5498dbdddb4c4331766a SHA-256: 4ffd592db7b8d91ccfa5bf0bc463a4f392b3a29f4c1e19729a3cc22fb439e634
176 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification strongly indicate malicious intent. The document body was unreadable, but the heuristics clearly point to a link-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://iveducentar.com/uploads/assets/file/redabudimudifutefoli.pdf
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/sovitawokepebarinedasu.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beee131d885---xasibe.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/dd62fb7bb82152d66c7e98cdee57833d/josemebujidon.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608213eaa6e7a---laxasizozutedege.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1609b294fadc34---dozikilosu.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d38c56c2ad---69419477790.pdf
    • https://dineflon.com//files/vaxol.pdf
    • http://ontsgoi.shop/uploads/files/redezagem.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160e6549e48686---68288277726.pdf
    • https://pakianco.ir/data/image/uploads/news/files/56076453703.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160acc689bc155---zefanemapetugoxoru.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5cc0bc73a---24346368565.pdf
    • http://ttmplus.com/userfiles/files/12040896286.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/r3c7qajsr3417ooduc8o8gr381/lupulafevuvewilajezi.pdf
    • http://sunnysidehigh65.com/clients/d/d0/d00d1ad1640c45b888f5e58ac216a5d1/File/41466188464.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076163034a00---60899802269.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/lp86e54i67r7clkihf70h6po7u/gebejesulafoxeduboze.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=best+chrome+flags+settings
    • 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_off0000f29c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF29C 16792 bytes
font_01_sfnt_off00010ab3.bin
f7631189b1ffc08ba20022da586029335a9e0cea295492aaa457cc3f871a659e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB3 10836 bytes
font_02_sfnt_off0001238b.bin
9cf5d601d4984893f3d35780b6e5851d34a33f23e460148d549350844e5dda56
pdf-font-stream PDF embedded font (sfnt) at offset 0x1238B 17100 bytes