Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7870b19c87359b1…

MALICIOUS

PDF

91.7 KB Created: 2021-08-13 17:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 197f4713756f18afc60dc4a838fab2b1 SHA-1: 8e3ea6c71dafe4444e8ac1af0512bf5e2431fc4e SHA-256: b7870b19c87359b116404d89700c62ccffc9bf6e37f709551ccb0ff5b6aafd16
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which appear to be hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external URIs and link farm heuristics confirms the document's purpose is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://sukhayurveda.in/userfiles/file/relakanitobeb.pdf In PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4fd82e9d7---17874649710.pdfIn PDF document text
    • https://udruga-invalida.hr/files/rowosebijibuvutekexemej.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/50434713283.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/93022072100.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f5994dded---74808551646.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/94931658767.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/dirotasiwanug.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/posapifom.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/e3ca44dd80ab706beffc1c2c0e1d0346/dorufotuvidajavetonafin.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/32ce1932edbb77c1e8f6f6ecc0baa03d/80796348083.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073eb005dad2---godegipegidufogik.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/665983c6087613f23f17c8affb142497/22872911506.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/jevorajidabamu.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105a476845a3---tafezaberupinot.pdfIn PDF document text
    • http://lohs69.com/clients/82366/File/saxipuder.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3ad09f0eb---84467821738.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/79953399135.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/siviwudepadererab.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/0du91ut312gko4kh7er9qf5279/sifebusuko.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/ff3f5af38a61014b987ffc5d73259a7c/73477587398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=best+wireless+earbuds+2020+malaysiaPDF 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_off0000fe45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE45 17732 bytes
SHA-256: 3f8f216ca8a3c5c4f96f4f99011c7a00fdda432e95332ae1fd9ab3e221a735b2
font_01_sfnt_off00012c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C90 10920 bytes
SHA-256: 3d023b53d7918c5e7da4731c5e9a64a2d51fe0c3923fbb44fd67dd7df58759f2
font_02_sfnt_off0001460c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1460C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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