Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa3fdc38744b632f…

MALICIOUS

PDF

102.4 KB Created: 2021-06-30 02:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ac45cc29203da5c2cd3aec2125a877e7 SHA-1: 7b9ce627e9b59cfcf65375af22ca36cf5246347c SHA-256: fa3fdc38744b632fe8335edd7683de88925457b7b77e3aa3f4460a93e6fe556c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9767

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://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a07e9dbc511---nopopofivamazenanidejexug.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160738fb44d00b---31291391688.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5c4d285d4---rofarejidopori.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cc33069f8---konimanosot.pdf
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/fafopeza.pdf
    • http://bjallstar.com/upload/file/metupul.pdf
    • https://augsburger-dartliga.de/uploads/file/19148971960.pdf
    • https://0900107678.com/upload/file/57940580305.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ada7c022793---75395891175.pdf
    • http://alliusie.com/userfiles/file/donoginikuzoxolusow.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607869ee2f750---47926519503.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe2e9e765e---kofixom.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800db9b97e3---96140292631.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0fe272925---fuzigekufixufatomufa.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/de439288196bbca82d074401c1015b33/26951306745.pdf
    • http://backupcenters.com/userfiles/file/24007892757.pdf
    • http://vipforiraq.com/userfiles/files/palejobo.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16098465530bac---72783021787.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160843f9bbe304---32762733358.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/df2ee7160a9325b8e57ab542288126a8/45066618637.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/a45c17e97da2633b98c180865f608ec1/nijekeri.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084aaedeb5c5---25362652870.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/0228429ecf849108138d25a832d73afd/vezif.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/d3nfes6k38jp1hrv5gf1itm70k/xekosise.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a642feee964---65830273097.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=punic+is+the+latin+word+for
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000f238.bin
1516881c3d44eb7ef4ffbee95d4fb9214f2070e470a2d4e1bad6096db26ed674		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF238 19180 bytes
font_01_sfnt_off000111e1.bin
078c0b57ec7b44d886dce0c6b32d4710633cbf25aa94ae86a83de7e7e4c45937		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111E1 10760 bytes
font_02_sfnt_off00012ab1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB1 16792 bytes
font_03_sfnt_off000142c3.bin
ac1a0665c47bc65948bcca199e57e050956223c6c186d1bc8ddb5a3303ee8de2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142C3 24200 bytes
font_04_sfnt_off00017e9b.bin
a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17E9B 3464 bytes

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