Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf284c3050039552…

MALICIOUS

PDF

79.7 KB Created: 2021-09-13 08:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 75c0cecb3caa705e09a46ae719bfec9f SHA-1: c052e77b6df3306752da1e35d0bf2a981da2463b SHA-256: cf284c305003955215c143972e0fb0d0d8279ebb1107b436cf865d0f567702ed
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV also identified it as malicious. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://yeditepegumruk.com/userfiles/33805217299.pdf In PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/h763plfqvtqnvcj1c7daccn1qn/12119018592.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/24282496630.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/15937300955.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/10818772274.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/repinu.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/36928878578.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/26036678678.pdfIn PDF document text
    • http://insei.eu/userfiles/files/35014405609.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/4653278850.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/89365610878.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/gojuninekol.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/71566078256.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/segikosokagizazude.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/32493550046.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/pegufewiwabimoboxedij.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613204ced6e92---13739178755.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/38165909669.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/xovadepuxotinowofuvoz.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/78266437286.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/43380106755.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/31374444986.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/xupupede.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b779e460ed---94155636472.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/704714931.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/doviz.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/42307997844.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138b3297e505---79618724890.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=lehninger+principles+of+biochemistry+latest+edition+pdfPDF 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_off0000d157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD157 17532 bytes
SHA-256: 928f8320aba29064ecb73ed7d3d9ce92c2bb02317f6343d7c2015f0a56dce18b
font_01_sfnt_off0000fe62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE62 11276 bytes
SHA-256: 92cde492446728c745294e2802141488ed040f1e5c003a3e290154253eb9ded4
font_02_sfnt_off00011841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11841 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.