Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28d135703b5b3aa…

MALICIOUS

PDF

104.8 KB Created: 2021-07-22 06:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0fe634c2906b6c085d96d9ec113dad9a SHA-1: 7bdd417d62f54352657dd10c9203bd27c58fed72 SHA-256: c28d135703b5b3aabcd20f6b9c177eb39cbf1c980ecad39e331e08e7ee9d39fc
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised websites and disposable hosting, indicating a phishing or malware distribution scheme. The embedded URLs suggest an attempt to redirect the user to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/5522ea8de02b36249a2ba2703c986f5b/konuvab.pdf In PDF document text
    • http://mindatpeace.us/uploads/files/donasi.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba89d9ebd09---bivewo.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f37821ba0b---dejijefofim.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/59449176868.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac32dacb29d---wemitalefifereripuruv.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/ee4720ce5a2f63c9e424760f5fbbc80e/bagojapebojisigesagok.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/4586801899.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160716d7dab5ac---wisotiwinegizobixadevisox.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/zizikejagib.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/fojtmfdob18hq01h3pcmtubm70/redunog.pdfIn PDF document text
    • http://vejwun.cz/images/84190073833.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210430211026102061458.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210518074202.pdfIn PDF document text
    • http://oceanstatevolleyball.org/clients/879495/File/69128007282.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/70943855215.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/juvupukotufifurujeme.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/0d479a0c15dcfeea97e70bfbe4920f2c/rereposid.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/ba99ec59b3dea8e2a0c21cb729f5e595/53870569215.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/71887848617.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085b3067cd86---vuvaf.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be04f26bab---lekegefukutazod.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/kizokebokulub.pdfIn PDF document text
    • https://angkalaris.com/contents//files/30388914360.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=different+types+of+physical+weatheringPDF 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_off00013610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13610 10960 bytes
SHA-256: 7264d1bdd94c551fb2506c5e5d083fc4b1d8c46edfbdf4d3af45a7efe730feff
font_01_sfnt_off00014f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001679f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1679F 17268 bytes
SHA-256: 7776671ed2fc62913bc5c9e035505554ff175738a827593d923917f71294a342

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