Malicious PDF — malware analysis report

Static analysis result for SHA-256 d528ebb80eeb457d…

MALICIOUS

PDF

91.1 KB Created: 2021-09-01 14:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d52dfd5d4cd01c99dc88babdd214abb SHA-1: 07c65c0c8f089332a1e44d80b1be4f34a3016b4f SHA-256: d528ebb80eeb457df0fcaca4190be93c191dc439bc3a747d3d3761395b5056f5
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites, some hosted on disposable domains. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggests this PDF is part of a phishing or malware distribution campaign. No scripts were extracted, but the overall structure points to the exploitation of PDF vulnerabilities or social engineering to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://poltinik.ru/userfiles/file/zaxisoni.pdf In PDF document text
    • http://yoga-privates.com/yoga-privates/file/55616750523.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021063011040598.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160983a1152adf---77576086100.pdfIn PDF document text
    • https://metal-et-verre.ch/ckfinder/userfiles/files/galorenepowumixiretigenur.pdfIn PDF document text
    • http://harperfamilyreunion.net/clients/3/35/3566a42c83b0accea4ba2bdfee5c7976/File/dosebubami.pdfIn PDF document text
    • http://overtonnation.com/clients/f/f9/f97855507a39dfa58978186db9bff07a/File/gegozakomimed.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/wigob.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/15756598266.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/po3hop8fgmo7nua3a6cgg8m7b4/42971625586.pdfIn PDF document text
    • http://hhsbluebirds1967.com/clients/b/b5/b592d679e9980e62d9d56be1bfb8b6b6/File/kigafumopolusut.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021051700422673499.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/ronevurumakalewil.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/44278788218.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/tapelevetulax.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/62581830833.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/65530876372.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/tafer.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/3b9d131315f1f08a3f583ee1be31bb9c/41774344197.pdfIn PDF document text
    • https://wsbtitan.com/images/file/dirameminagi.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/6736879516.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c5a873ae0---babefazolum.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/50348643786.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=pictures+from+italy+charles+dickens+pdfPDF 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_off0000fac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DD 11192 bytes
SHA-256: 9430ec497b8c2c696f8c4efab43733ea30e1ec3e28c4e88cafee596169495e39
font_02_sfnt_off00012cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF0 18848 bytes
SHA-256: 2a1b48589759ac313916e375e158fccbadfa7ee0c3bb42e0ae1bf3ad36b47dae

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