Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42e686b8054c2e1…

MALICIOUS

PDF

96.0 KB Created: 2021-06-26 10:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: efd06e990526b71439b0fe4128e053c2 SHA-1: 5d16e68ef35c872b88172ad88579d98a450cefd9 SHA-256: f42e686b8054c2e16dd1cb9f5d7b2b357bc520e72eca402b31d45c8a67b76589
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=smite+looking+for+players
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/3973d79ed878c82b6a460cc251daa019/ponukopinupesaz.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecd6461813---jojamulonewitegalil.pdf
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/qmamk9m5dtrse10sigp5nhej9q/73745826491.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/c3996a8985c3df5687911d97159b62dd/54866430558.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/ubaa2qvaofekhsd5n378jclov8/redapakujagotidiro.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/d1f45030edaa0426085adfaeb06e08c6/getepafupajemuvejobiv.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/a16e4cc89c0012f6acd84e5fbc45e8d8/59682195616.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f03a3638d8---tifogakegazanokagox.pdf
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/magonijalosezejigul.pdf
    • http://kibbkw.com/uploads/file/66446523336.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/cpncq4iegpo4alg9o1f3gv39sm/nupidafugoxomafa.pdf
    • https://vestol.bg/files/file/fuferoxepabixikimowusaji.pdf
    • http://hesexpo.com/img/editor/image/file/85063634996.pdf
    • http://hzdsbg.com/uploadfile/1620551038.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909a4b9488e---5466036809.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/6fea7f4baf253e7900c2f3523e35fe8c/44750127941.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/wifataxokodivegijiradivu.pdf
    • http://computer-rudolstadt.de/upload/file/dinerutomuv.pdf
    • https://ascinfratech.com/clientprojects/trading/file/zizujafepazuso.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607033b218161---zuzovelekeluz.pdf
    • http://studiovalentini.eu/userfiles/files/vabewetijupuzufo.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5fe647160---36018180492.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9dadda96e---48240205919.pdf
    • https://cafesca.mx/ckfinder/userfiles/files/51261904742.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe42.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE42 16792 bytes
font_01_sfnt_off0001164f.bin
7a05eee44fb6ab7b73eff6201718779f04822b799a1029e8296e244cc6f26b52
pdf-font-stream PDF embedded font (sfnt) at offset 0x1164F 5524 bytes
font_02_sfnt_off00012a0d.bin
e5d6a367706585aac7f6ede3480f3e8aac60569d3d195b0407c6f2f30a002aee
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0D 10984 bytes
font_03_sfnt_off0001438e.bin
c5a8efa6001a5e187451f3c3a60fc9c4de0300216029d34a961c0d8312b1ece1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1438E 17624 bytes