Malicious PDF — malware analysis report

Static analysis result for SHA-256 f38f9f4bd6999bbb…

MALICIOUS

PDF

131.5 KB Created: 2021-06-28 12:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1d13344414d05c125aaa9dba88f22322 SHA-1: 454b11c80967f57b76b812b187631d6ebc1243e0 SHA-256: f38f9f4bd6999bbbcdaa4059e9b79ab5edce57d4ef0e498ecf95b987f0577733
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristic firings and URL analysis confirm the link farm pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9814

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://transmar.biz/ckfinder/userfiles/files/9137833420.pdf In PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/k7h53lr39m4r6gvkj42mnir061/jogej.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/f0f701adeb05e4c9d7584ab54f6f38d8/87235135972.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/13873296931.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af118cd167---71709365584.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/2710te079vs8oc9cgrl45ejiop/jugujize.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fce878658e---vaximuxuwapufedu.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b20f2b10a83---41743944009.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160baee881d59a---14389233104.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/83574861062.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/wajegopidimuniriwemipur.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/228faaf55020699d0f58aa4bf70900e9/zanokupolanuwinodageza.pdfIn PDF document text
    • https://efnnma.org/files/file/ruwig.pdfIn PDF document text
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/timasatasudareru.pdfIn PDF document text
    • http://dbhsreunion.com/clients/21010/File/nogazu.pdfIn PDF document text
    • http://mytmbc.org/fckimage/file/33782212429.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/8ad00eab326d845bbba4522e0d026bbd/38695572174.pdfIn PDF document text
    • http://ibb-online.ru/f/file/32317690164.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/70d04623a1899d623896d1819f87bc13/86284493118.pdfIn PDF document text
    • https://yuss.it/file/36679451848.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebd28f130a---24754735760.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/38kcernep9ge8rr6u3qe7kgpuo/wodilafazi.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/86642889478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=mathematical+logic+for+computer+science+2nd+edition+pdfPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/96744951560.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001853e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1853E 16084 bytes
SHA-256: 325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7
font_01_sfnt_off00019a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A6B 11280 bytes
SHA-256: ee137aabfbea12514b739fc6e7decd2601697fcfa3e5ef15e5d649e83422a63d
font_02_sfnt_off0001b492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B492 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001cca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CCA4 19932 bytes
SHA-256: 0cc336ad47ebd7312162a6ba81a8684a7e08ede8a647123b7472d1effa7a38f4

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