Malicious PDF — malware analysis report

Static analysis result for SHA-256 b08e5c299b2f1182…

MALICIOUS

PDF

78.3 KB Created: 2021-09-08 05:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6818f06bcb2f4eaab7219536418a1513 SHA-1: efbb7ff688833fc99edde0968d7ac91390106464 SHA-256: b08e5c299b2f11822d5849cf141167a6156db4ad43c784bb17ed66387753b33f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it is part of a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://smidgel.ru/uplcv?utm_term=class+10+book+pdf+bangla PDF link annotation
    • https://lordoptika.hu/files/files/fawaburedaf.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/vopab.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/pikuroz.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/p7dot5djgsu12q36qhg3a5kki2/87406405438.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/gemevutevenukij.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/43582761981.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/15198667806.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/c9ae16f248f1a251794290cc82308b42/73560907544.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/9d9f945dce03d33bd7ede78fef3956cd/43789298934.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/1gvsjeneqps150bg3fu90vbvi7/33855447923.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/27569729702.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1f189d679---84861240367.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/55395529628.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/7i8ant6mfrmp4n7ngi8p7mhof2/63930430288.pdfIn PDF document text
    • http://salwex.hu/file/jabasoxinagikiza.pdfIn PDF document text
    • http://taxfreepoint.com/file/62867884018.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/77267568551.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8610fd3b39---59445633261.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160905b4fd8dc3---pipejuva.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/modinurazofa.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4b0c7c145---7721236128.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf2ca6e3bd---peberomevodomefix.pdfIn PDF document text
    • 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_off0000c764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC764 10688 bytes
SHA-256: 36e944bb4d75872d88ee47fca4d095ecdde6ffab57817dd98ab71a89cdf3577f
font_01_sfnt_off0000df9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9A 19688 bytes
SHA-256: f3f14d021dc6b3c6f2464f7e89cac5a95ebe2f272e2dc1dea365d766a7bd6784
font_02_sfnt_off000113bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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