Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeefba122529309a…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 15:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: af79fce760bf0a23ca551b6c01127229 SHA-1: f0d63978f3f8e12e2a1e9bf26ed83ee0c337dc5d SHA-256: aeefba122529309a5a0dd607fcfc65b14fa55e41c3fd90249cb882285120aecc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was identified as malicious by a ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external URLs, many of which host other PDF files. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests a common tactic of instructing users to open a password-protected archive, likely to bypass initial security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://vico-immobilien.com/ckfinder/userfiles/files/51341389476.pdf In PDF document text
    • https://widerbet.pl/userfiles/file/46124893045.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/xizasirabebezajobule.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/worimagefonilesegumef.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/65568470141.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/46607866191.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/tigozipadokex.pdfIn PDF document text
    • http://efrex.cz/files/file/18129938376.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/96230106066.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/sefujaxebatofanofibodu.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0c82b0146---66066639337.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/refuler.pdfIn PDF document text
    • http://deltools.com/userfiles/file/davefidivuz.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405f568a2a3---kakadag.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/29445277664.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tosowenadew.pdfIn PDF document text
    • https://ms02bet.net/contents/files/mukunawovoxe.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109152047494080.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/napulatimatosozajer.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161489293905b9---kuruge.pdfIn PDF document text
    • https://cristalensi.com/public/File/defaniteminusanegutob.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/38038718464.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/lenuputukepi.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/61566853983.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=android+app+create+pdf+filesPDF 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_off0000b179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB179 15324 bytes
SHA-256: f57ac0fd0d8c3fd3e196e69f6f6423a7e7067a190fd2bfbe2803c227f4ee339a
font_01_sfnt_off0000d781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD781 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF98 10596 bytes
SHA-256: 0f8a923cfa25e433f668647d024ed1273d6bb31c162dd32d8b2f4ba2c7a80a7e

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