Malicious PDF — malware analysis report

Static analysis result for SHA-256 e16651af00c50a02…

MALICIOUS

PDF

86.4 KB Created: 2021-06-27 11:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c6d376314d105c41269683ca0d404103 SHA-1: 67fed57723cc5299145711a732c41f79cdd0ff9a SHA-256: e16651af00c50a0280786f187d8cffd0c6a295a16bc8135f1a6c5fb0363edce4
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://gizaviation.com/uploads/files/18479337162.pdf
    • https://demircanticaret.com/userfiles/file/31612512262.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba2f3435a---10527830382.pdf
    • https://equinox-e.com/upload/files/99298805843.pdf
    • http://spy-military-labs.com/userfiles/file/jozadufexox.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819091b9ed7---zudavenigox.pdf
    • http://turagent007.ru/userfiles/file/sumava.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/077kid2a58jlrvi439ohp9v6m3/filatezisowumul.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfae5a7b4b---5835525052.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd949dee09a---xiwawobiwudolobakalalalo.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e226e5ad18---fusejejilapidubevakolade.pdf
    • https://vieclamday.com/userfiles/file/nejesuzudasifamixa.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160863ff5912b5---7243520497.pdf
    • http://tunesistudio.eu/userfiles/files/gotawipilewiwuxifipef.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae621ea2dba---lujilig.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/85da1cdc6ada673c3c23c0ddd12ce267/pevinuwowibinafizanuxel.pdf
    • http://al-bandak.com/userfiles/file/86232502672.pdf
    • http://bortran.com/upload/image/file/20210531102734.pdf
    • http://tai-yang.tw/taiyang/upload/file/92270401304.pdf
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/pefosojevupi.pdf
    • https://avgdesign.com/userfiles/file/42092671126.pdf
    • http://www.cerathai.com/image/upload/File/52149677138.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=nice+words+with+the+letter+d
    • 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_off0000eeb3.bin
1aea5229c3e17f1722b1fc0f30e7dfba6b44a98002e5854eb7273b28caa3435a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB3 10264 bytes
font_01_sfnt_off000105fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105FA 16792 bytes
font_02_sfnt_off00011e0c.bin
afaeee1d6e674cef5a36b0dad456b4681b352d1ba37ce6306e401628ac7d34f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0C 17760 bytes