Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d63d25846c38ba8…

MALICIOUS

PDF

80.8 KB Created: 2021-06-29 07:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 721c3f8824d003507467e6d0c9f18246 SHA-1: 0050b85551ee98388feab3e27223adb546475a14 SHA-256: 7d63d25846c38ba8022d09f0db8f1f8393ba6d42da951abe4a2b93b0e6254d66
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised CMS upload storage, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d6e8d23c2---mevirafuposibaf.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081911e5be43---bimawijeve.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/9srlj9gt93h3uji9r0fbc8tosc/papexarazodazetur.pdf
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/rijuladasizafomigabukigev.pdf
    • http://divorce-difficile.fr/userfiles/file/nixebovoziwinanukolari.pdf
    • http://shiokuda1.com/contents//files/12045142554.pdf
    • http://suapaiatuipelehakefamily.com/clients/80707/File/buzejulawofadamorimur.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb921a55b6---sititebeto.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/a6a2ed1f15689d3226535afd06f7a02b/bekozeneziwejatobeminol.pdf
    • https://bamfieldrental.com/userfiles/file/82882957081.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/e74fba958b4b4fd96593adcfd660fe81/lozuzuwupejekojegazewon.pdf
    • https://amd-export.com/site/upload/file/37464251244.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32e68b9e96---56369514051.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/e477e6ed8aaeaa1aa563f34e160d458f/16972390693.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/e4176908fa8fa3868bde74f313730ed7/58937347050.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1034e1fea---77274601529.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/bbf8c8bc0849eee9548991359604586c/jorawifujedubutomo.pdf
    • http://sity-luxe.ru/userfiles/file/53874108885.pdf
    • https://etonbio.com/newsLetters/images/file/wakoxuj.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/bgdb8t751b7q4vq1jjqrts793c/46883246765.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e2fc2a8d6---1489439128.pdf
    • https://europartner2.pl/uploads/pojunax.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/c5e367618f78a63d360f99529b7efbc7/dolafeno.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/9cc2faa91ff458198c2fac41d61e2064/25068329194.pdf
    • http://austral-immo.com/userfiles/files/22929933778.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc06b2e474---83987415627.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=types+of+weathering+of+rocks
    • 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_off0000d9ed.bin
b8b23e13245131798f4042fb1bd7c66235679d5f32c3b0fbb02bd26842c1115d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9ED 10968 bytes
font_01_sfnt_off0000f386.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF386 16792 bytes
font_02_sfnt_off00010b98.bin
6df6268bd25e2ad97cba628a614756d299492bf4ca42a43f0bb3963ff2315312
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B98 16364 bytes