Malicious PDF — malware analysis report

Static analysis result for SHA-256 0688197892baf9e7…

MALICIOUS

PDF

103.4 KB Created: 2021-07-06 04:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c4e6eb44bf5efe565ce6cec36c1dba1c SHA-1: 12d921e07037e0f20c52f1c82b92e048db099b99 SHA-256: 0688197892baf9e7b07cea944e98ee680050276c4e7de69b8cf2dabae150743d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites, as indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

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://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/d73146ed7dbf677b0e4ae615693d94e3/40998169387.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607f053b169ee---79131729911.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/0cb8164bcb2af06f1cf36f21df75356e/bukibasigapox.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4a8ac737c---jemitelijetedinoluzuxe.pdf
    • https://alakharia.com/public_html/userfiles/file/49935211165.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b25a2c4b920---21423007519.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/j7api497srhevbe0002am6b859/kaxerisewuloruledumel.pdf
    • https://b2cexpressdemo.com/userfiles/file/82742040782.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/otchmnt4o0nquphsm29vppnqs6/71441764284.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfe97e1f6f---fomemumodazopemelil.pdf
    • http://bulmarconsult.com/files/65348914202.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/3mqjehtrirnj50e2s0o7u1o592/bilun.pdf
    • https://cottonweb.net/userfiles/file/19958950744.pdf
    • https://szabobuszberles.hu/files/files/vugakiremimofi.pdf
    • http://aaaexpressac.com/userfiles/file/68959888251.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ed5566dcd---8693698242.pdf
    • https://bamor.org/userfiles/file/larerelid.pdf
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/97434223584.pdf
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/jekelige.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/rs8s3d60eqg4un5jajh5novc06/16459695037.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ed1297119---nusedunozevetifovumonenek.pdf
    • http://4bzsoftware.com/Images_upload/files/17995184110.pdf
    • https://ilcaminodaugo.it/file/7231732064.pdf
    • http://strandedtattoo.net/file/61011368808.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f05ef5956a---vekubepugo.pdf
    • https://allcreaturesinc.com/files/files/fumajivadidepejigijo.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/f82f99a52012ac23709e588dd951d96e/79121332766.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=border+terrier+mix+puppies+for+sale
    • 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_off00013389.bin
a050713c3e4d8a61f2cf8a23a8718770d74e740bdc283477591078f888777476
pdf-font-stream PDF embedded font (sfnt) at offset 0x13389 16776 bytes
font_01_sfnt_off00015ee8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15EE8 16792 bytes
font_02_sfnt_off000176ff.bin
d10d3f025c03d120d8e04256e474199eb1d0bc03744eb39efee76493ccc3b6c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x176FF 10808 bytes