Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b6ebf6ed373d069…

MALICIOUS

PDF

71.0 KB Created: 2021-10-03 18:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 25541c589b5bea471bf978646be22908 SHA-1: 858a01a38c94cfc7d2b0e5afa91ca99c195d2262 SHA-256: 5b6ebf6ed373d06987a62f38223d33efe883fe24d85f52f8296fed6d0d494c37
156 Risk Score

Malware Insights

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

The file was identified as malicious by a ML classifier and ClamAV, flagging it as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised or disposable hosting. These links likely serve as a lure to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://www.privathospitaletkollund.com/ckfinder/userfiles/files/bosumatizalu.pdf In PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614e057152d23---wavawebusi.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/66236982062.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/tagozizadajetejigovuzuva.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/boxeguvewo.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/f7fd120f3fbe3bfcfc05722000176f86/56316803464.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/wadolurapisajinixuri.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/mimubiwidofu.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/65886800364.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210928071327_1759195831.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613da3b22239d---15689777857.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/57385145504.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-6/20210906080909128597.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161432c6b19340---jetevilezoretewirone.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/sanuvawogetiv.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/nolux.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210930151343.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/75063582089.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/gusetepak.pdfIn PDF document text
    • http://forti.in/userfiles/file/gunulasirufox.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/mawonatibobamakovabelin.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/71602318806.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/56881487694.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/22495425661.pdfIn PDF document text
    • https://panoramabyty.cz/content/87520775523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=histogram+of+two+variables+in+rPDF 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_off0000b20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20B 17104 bytes
SHA-256: 8a3c33d5b3c46112ecfcbca1f894bf5ab67d33a2d2a7663d56f0bc45d956d561
font_01_sfnt_off0000de11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF628 10840 bytes
SHA-256: f77586b0c78783896e43fded12742c1a1fef01a8cc437716c0b87d17119a0e13

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