Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf8f1b0134039f9…

MALICIOUS

PDF

73.7 KB Created: 2021-09-03 16:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6f45b8ecc418e0378eadd6fed954351f SHA-1: b26a7c355049719e224ebd18c32ab2284eeb32a2 SHA-256: 8cf8f1b0134039f9b59d6c8499f4ec0da3f6c3c0909057c0eee89935ca6a59c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised CMS platforms or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it acts as a lure to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://pjcwyy.com/upload/file/73642619727.pdf In PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610a0aa96506a---60550093323.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/fotivagoki.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/supef.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/zeziduvawalijenaru.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5c1054871---lunosimu.pdfIn PDF document text
    • http://gibisch.org/files/files/41513224625.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/kukajikotozatitipexarupe.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d43b3cdc6---kekawewine.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/vekitajodapubezojefevovew.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1611d5547d3bbc---81604476131.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/wifapidexadodes.pdfIn PDF document text
    • https://maintogelonline2.org/contents//files/nomikixitomakomovita.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e8d373a05---70060163889.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/34355849892.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/boxujivavunomoputevit.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/6cc5a033a980de8ace80137b340ebf13/1556588086.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/tegilobejowu.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/pivilusi.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/dupetifumojaki.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/v40tfa3orm8v5o0vaf89l6uo2n/tirij.pdfIn PDF document text
    • http://suacona.com/clients/16856/File/xobiriwozanizanimiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=electrical+power+control+system+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_off0000bd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD11 16588 bytes
SHA-256: f880ddedcfb93b27eb6d84449caca55fb0b31379edcdde239e1bf58e817533c3
font_01_sfnt_off0000e7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCD 10964 bytes
SHA-256: e281ed2262683bf42e6141ddd9a6ebd9de6e9d383d262eb1b2ba99eff95d1f04

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