Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bfeed31bf47cf74…

MALICIOUS

PDF

70.8 KB Created: 2021-08-31 17:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb73053acf699273033cb2299e38673e SHA-1: 1560d751a91434f109f2503add255b287fbaec65 SHA-256: 2bfeed31bf47cf74539a5b774962db136ad47202160a45cc9bbcddbfecd0c40f
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to other PDF files hosted on compromised websites, indicating a link farm designed to distribute malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of multiple links to potentially malicious PDFs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f3e211434b7---91206944277.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/79637028648.pdf
    • https://dreamscapes.ca/dream_scapes/userfiles/files/siribuxolonavab.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/9923d686e3e00e87c321dfe057ff6e98/lunore.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a80b768f374---ninodi.pdf
    • http://yearbookplus.com/uploads/ckfinder/files/70820402670.pdf
    • https://careersourcechipola.com/files/public/zewemizujezowa.pdf
    • http://ajtoablakcentrum.com/_user/file/xujutupim.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c3303e778---78085390963.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffeda153ea---53540321531.pdf
    • https://yptea.com/data/fckeditor/files/goxoxub.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b27470ef4c---waxigazax.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/852be0be006044321aa5d10516e8cd11/78147695252.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898eac92c71---92492777596.pdf
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a159c538a---66804467676.pdf
    • http://xaydungphongphu.com/uploads/files/65881509137.pdf
    • http://crmloccitanecr.com/campannas/file/bafatipa.pdf
    • http://xpressup.com/userfiles/file/zepewivogijaxo.pdf
    • http://pieseclimaauto.com/files/file/nejusobazavu.pdf
    • http://beateromer.com/bilder/file/pizobetenukivaj.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hebvqk53kau1luu5kcde83fig7/94609392127.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+the+definition+of+concurrent+powers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b62f.bin
161cc17308dbc382d8c6a03bccd0150ba3d9a34c22cad76b94de0534c84f5c2a
pdf-font-stream PDF embedded font (sfnt) at offset 0xB62F 15564 bytes
font_01_sfnt_off0000dba4.bin
5f0421b42ecbee695a5220dcd680367fd63109c6a5f5cff7c4d9e784c46a3d75
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA4 10852 bytes
font_02_sfnt_off0000f4c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C1 16792 bytes