Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b4420134c69e47…

MALICIOUS

PDF

85.6 KB Created: 2021-06-30 21:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50cc43900438f3859ff65e59d440dc67 SHA-1: 30cf577e9c3a72dfa44defb450a88123e22826c2 SHA-256: c8b4420134c69e47aecd6d8e0d893a905065ee95522f55b6a8e67000bb8d0859
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are identified as compromised CMS uploads. These links likely serve as a link farm to distribute further malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/mr01kosi6j6cpidrqm2pjbkai3/donaratumusoga.pdf
    • http://cowmoo.org/ckfinder/userfiles/files/51022664615.pdf
    • http://gorisum.net/fckeditor/upload_file/file/zodapu.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/ee9b15ca2399dece9a614925f7a8e749/katuwogur.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1abc5e241---femukekulefavogola.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070b54f9e283---gasija.pdf
    • https://viecmarketing24.com/upload/files/84700236770.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075f788d25b3---porubagamit.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed3b671a6a---18152007236.pdf
    • http://heyumpnd.com/userfiles/file///77903999844.pdf
    • http://unipsyclinic.com/userfiles/file/20210623214443.pdf
    • http://thermogroup.ru/uploads/files/66190111871.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78ba1ae616---waxemi.pdf
    • http://alexdisinfestazioni.com/userfiles/files/mariga.pdf
    • https://masihpt1.com/contents//files/japunedixapuwejiditude.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2706e5d79---berunuxeniliweve.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb07e4775b---73378023092.pdf
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/97146259343.pdf
    • https://roweryelectra.pl/app/webroot/uploads/file/16210561584789.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/690c0970deda116d28f3b4247bf7790e/kojibini.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/d79267ab6b0ea34fae60a5c8b5ce9934/66236712193.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/85fd8aa23d87e38482370b4c3bf756c3/bedilorukonukirovotogi.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1608e52e6bae68---35016016551.pdf
    • http://geose.ru/userfiles/file/57953378748.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=columbine+poisonous+to+dogs
    • 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_off0000ecf6.bin
fc4853d4ef39d935d835c712f3f5da350bb4c2ee74d96dbac036a0dc992e4add
pdf-font-stream PDF embedded font (sfnt) at offset 0xECF6 16884 bytes
font_01_sfnt_off000118e8.bin
0da792ec03e8de878e1dbe81b9d364ea705d96a10d63c752e86016db07a43067
pdf-font-stream PDF embedded font (sfnt) at offset 0x118E8 10744 bytes
font_02_sfnt_off00013125.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13125 16792 bytes