Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f568ac2685ea8ef…

MALICIOUS

PDF

75.2 KB Created: 2021-08-30 15:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e8d0cfbf912a8ab6c64817b66cf72a9b SHA-1: 91650380f481970e424c6e6dffcd08c2ec2ae463 SHA-256: 2f568ac2685ea8efd7c5d6921c1e38f2b73aeb91e2ce4a43d29ce1764787341d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://qca.ch/userfiles/file/40785406161.pdf In PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/gadoximavajakavul.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/zovafabevazinosafelexot.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/29704440258.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/509147b8a457ef8840eaa6af1b9e05b3/munilulowumumezexaw.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/72106840284.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/mavizuwanivonotesosopumin.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767661b5961---xeromipinagipadi.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202108230929055234.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2d3ae5815---44268951998.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/28c193b5a9ec02ff180d835e7cf6c230/rojozuwapomubete.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/24302316504.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f24506a81a2---6613519648.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609757ae59665---verekewuwagilamodes.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/41806844496.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/babaruxesemefiwixejaj.pdfIn PDF document text
    • https://ebdaatcoop.com/userfiles/files/11234301194.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/widubomanifute.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b64efb4cb78---metoliwomemojebefofufis.pdfIn PDF document text
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/muzonusexo.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/0qskipc5n831ouk25bbq0cm961/16744497198.pdfIn PDF document text
    • http://goneviaggi.com/themes/userfiles//files/kivugufitezowimij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=watch+justice+league+free+onlinePDF 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_off0000c38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA1 10840 bytes
SHA-256: 4c78d1ddbec04c53a388f98412e88034de85975ee841c454c9e49312bb5571b4
font_02_sfnt_off0000f49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49C 16216 bytes
SHA-256: f3a8b7c96628fb36c030247d1be2cfd88018c05be68cd5fbcf4589ea82a2df0e

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