Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d471527f2f15ca…

MALICIOUS

PDF

90.8 KB Created: 2021-08-26 12:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dd4d33683d225de9c3ddbfe380cb3d65 SHA-1: 6799c2af7b5d63836de48d5324c40320aabc62a6 SHA-256: 20d471527f2f15cae35f87bdde0ad583d36c98ed690692519917b358b4fda1bf
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file functions as a link farm, containing numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://orsam.org.tr/paketler/ckfinder/dosyalar/files/jawisewikesikeruta.pdf In PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a8dedae84---71606705320.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/e432ceb0bb318dcba29eb18260ea4d3e/tadadodufav.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/rubebiline.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/zigoromeveligapud.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/79436493066.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/paditozaxudogexotuvofakaf.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/jatizoxazukeduzelepopogi.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610340f970b23---setuxilof.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/05m8o801adf2jhhgc6sqfo8u16/25940544538.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/s7nsmeog3u310ur42c8kvvod3i/70232788101.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/gosobikolipetimajopo.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/71673709351.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/2bb559a6a64bac47661b3493d14764ff/95476290137.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/43965792824.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/1087dad88658f05edabf41b1a72368e2/sopuvizedotigivu.pdfIn PDF document text
    • http://normel.org/files/upload/file/64906427278.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/29638583640.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/45435705923.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/21811798843.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/51152407765.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rnegrpr6k2fvbjm8gkitkne0g1/gunopajugo.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd46df167b0---34846340218.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf0242ec59---boxawinisaleritikaf.pdfIn PDF document text
    • http://medipharmacompany.com/userfiles/files/48182913887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=external+criticism+in+philippine+historyPDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA3 10840 bytes
SHA-256: 751054320100fbcf52cd79f2dab76c644427c6bc2e6f1ae111555337d43b4e68
font_01_sfnt_off00011475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C87 18240 bytes
SHA-256: c6462463ddc6faa822dd0afbfc1a371e99bc5e934b79a2938e73c4711bbe4cc3