Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e50904f5c5f32bd…

MALICIOUS

PDF

86.6 KB Created: 2021-06-29 02:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c7226670e64b309a260fcee180fe35cb SHA-1: 13a5e9ba24869bff73935cbe257f11685ca010cc SHA-256: 9e50904f5c5f32bdc6a63882206842c57413b7fb3097fe2cec4e7db50bd53c80
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://dynamic1984.com/user_file/file/47503626268.pdf
    • http://gfb.it/upload/fck/file/94903824200.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/0a728949255914e4154412aa509ca970/55799215579.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bf2f48960---digumupapoloxamof.pdf
    • https://digicpictures.com/downloads/fofidukozatenisaruwa.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/ikk3333630akeeng4t9bppnf90/19351176243.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/c0i4sqfumh834234c5mqr6iiba/tolinep.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16098a4bc6d025---begetiburupatu.pdf
    • http://short-story.ru/upload/file/77992398748.pdf
    • http://szsahsh.com/uploads/files/94811240587.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095a1a6626c4---72454039469.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607be4c315941---51588279047.pdf
    • https://astek-telem.fr/userfiles/file/nizelezenevugi.pdf
    • http://aaaexpressheating.com/userfiles/file/21243103783.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/m8bludnocpv3s71imbapvihvd2/31993578956.pdf
    • http://jshanwoo.com/ckfinder/userfiles/files/13993466118.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b30ee64a5bd---61491189254.pdf
    • http://apricomm.com/userData/board/file/nopawu.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf1a49a352---42629409846.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609022ee28ed6---ximovepusotinub.pdf
    • http://traiteur-ribot.fr/userfiles/file/60924070058.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72b748abd4---82414746269.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078af0609aac---37656937001.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b57094a939---13610681335.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=what+color+combination+makes+grey
    • 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_off0000ee06.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE06 16792 bytes
font_01_sfnt_off0001061d.bin
90196bc95feceed81d55a15ad536988398110627a0fadeaa8f1aef5012632c4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1061D 11016 bytes
font_02_sfnt_off00011f99.bin
a4fb500db0e8b674655b1f38ae23f28560c4fb04e28691abb7cacf5fdea2104e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F99 17488 bytes