Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b71a357dbf99df…

MALICIOUS

PDF

86.1 KB Created: 2021-07-30 18:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a176a31d4a7ea2db677072d016cb49b3 SHA-1: a0dedf73837cc5839574e26dc2087195f92fecfb SHA-256: 85b71a357dbf99dfc31be988d952481615c80e4954cdd647ef1b8a93a521ad49
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://chiangmai-clean.com/user_img/files/nariwakiso.pdf
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/lakaleber.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d3598b081d9---wulexeze.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/7b5ec75f04bc99836d5e4a69aaae2c2e/96346555292.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5eb3d010a2---suvetunikadebimurimu.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/janesilev.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/53b3c951fdbc92435af9fa734dec3be7/tudupewefarekoga.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160874ef92e089---vesarogizalemupof.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a82781c6afb---pimobovimuromevasamake.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/cgg3uhlrslb8neklt6m7acun74/zikexijutimisagemugode.pdf
    • https://vishalahospitality.com/ckfinder/userfiles/files/dumupejosifodabodorosan.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/83ggt0h7opkt4dl9cj29bos0q2/feboseposuxajevenefuv.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dc1f499eff1---lokovaxa.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/l2m2vthnsr0o6cr9i3upn9fqt2/38340065984.pdf
    • https://wronba.pl/uploads/wysiwyg/file/geladomodus.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/ddc78bc38f7a6adeb0e623cb597f2a34/lilabegiwuku.pdf
    • http://internationalnetworksolutions.net/files/
    • http://xboxheerlen.nl/userfiles/file/50450196828.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/ijkmlbho12fv64i7ls3is2ling/46444041984.pdf
    • https://zionapostolicministries.org/uploads/file/15271613554.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8fac31c75---kasuxabujikabirilezib.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/aa3c54ded306a63279bd3f4b32f0e8e8/getimerofasunus.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/67343da8daca3ebd4eca86778870e46e/rigibovupezuwi.pdf
    • http://seoulsquare.com/userfiles/file/wonuvirabajexorojomagas.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+make+receipt+for+rent
    • 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_off0000ed2f.bin
52967cd8a286666ec2be9cae3d2ac2a8a04f54243e05e4a3f34364d7e0ae22aa
pdf-font-stream PDF embedded font (sfnt) at offset 0xED2F 10596 bytes
font_01_sfnt_off0001055f.bin
9994d774902a12af0242fc2ea6e6fc6e68652c758ed9d44ad1c095776d672935
pdf-font-stream PDF embedded font (sfnt) at offset 0x1055F 17324 bytes
font_02_sfnt_off00013234.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13234 16792 bytes