Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffba256e3a594a7e…

MALICIOUS

PDF

74.2 KB Created: 2021-09-01 23:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c6f8168bb34a8db380605dc9a658f63 SHA-1: 47cead676fd1461337f594a278a94402c8f67bac SHA-256: ffba256e3a594a7e5bcbb8173ec278f6ed0a9740887f44048f8d196d05e5d305
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute further malicious content. The document body is unreadable, but the heuristics indicate a pattern of hosting links on disposable or compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://catbasailing.com/upload/fck/file/27426608378.pdf
    • http://inannamsao.com/uploads/files/96875004770.pdf
    • http://radio-salsa.fr/php/rs/filesupload/file/12330380061.pdf
    • https://karpataljaturizmus.hu/upload/85013247740.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/0824b9901c2a0d8aa8dfca12006201ea/60749919820.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609afab143d0a---modaguluxap.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edffe179df9---dunesavi.pdf
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/66777464604.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c714362aa3f---bisamegimiwovemukipiwa.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/0eaa38a393029a787d84b16f9b205d26/90320605706.pdf
    • https://cairparavel.ro/app/webroot/files/userfiles/files/binigesavajuguw.pdf
    • https://thehouseproduction.net/file/gexomavagoxazali.pdf
    • http://zimaletto.com/uploads/file/838840604.pdf
    • http://tafgambiatours.com/userfiles/file/rowuzaw.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/6796d63e8429beb5e3b502a7f1f9780e/63670102881.pdf
    • https://uleiuri.ro/userfiles/file/55254284277.pdf
    • http://phillipsbrothersmill.com/clients/6/65/65192871cce8a6e36080a9ebd2808b02/File/97386983566.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1612c8d8569f24---92783896100.pdf
    • http://ecole.ru/text/images/file/36292581360.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e47efacc138---14906829028.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/cjdk1lapvvqbttfe6akgu5gii6/ziwedijoxilonikobogo.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/v4538iqq1esgak3n4d720mu4m5/womofex.pdf
    • http://morecoredesign.com/images/imageUps/files/35062774274.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983c0bae12a---45408713842.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=400+kr+to+usd
    • 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_off0000c218.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC218 16792 bytes
font_01_sfnt_off0000da2a.bin
c06871bba05073b23c71f5c146db8d3ae1e4db87967fafb1ccaa0267a3fd8a87
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2A 16412 bytes
font_02_sfnt_off0001047f.bin
1e95e676592f3987b42f0b7047dfeefe74907451754e9e88720d9aba8dcbb84d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1047F 10000 bytes