Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b5812a98af61a5a…

MALICIOUS

PDF

78.8 KB Created: 2021-09-02 21:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a28898dc9ab00987e7fa2a84745336b4 SHA-1: d76f8f0a76cd6f88eeba1446734636beb606cf44 SHA-256: 6b5812a98af61a5a17042ee15aaacf50b59a967ab9dc63ccbd2197e1c53965d3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious content. It contains a link farm pointing to numerous URLs, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The presence of embedded URLs and the overall structure are consistent with a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://chcial.ru/uplcv?utm_term=al+quran+tafsir+bangla+pdf PDF link annotation
    • https://x-software.cz/data/file/67768784741.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/delurixutexugu.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091492340bf4---73542116853.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210617_020631.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/81965065770.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a741df6f59c---57606134750.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/8fe66759d4ec5aaf0b8b23fddbd6e010/49429634173.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d93de8ceb9c---93556661483.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/6s9f8acfuktnb1u3h83po9ji6l/xodemukilovu.pdfIn PDF document text
    • http://christopherdallo.com/file/44568264778.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/55205933282.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/zoniwivumetuvip.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f071255919---zorax.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/ahprhd7dliea98qlbkvadsbkg2/farorifirapuritag.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sezeji.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/87083851683.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160770a78a5e51---1009814189.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/d7b9ad7f5cd1d7bdf2f5eac5ee93fe3f/xomewexozaperusivivunatoz.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/nepomolaxit.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160908d3ddad06---ropot.pdfIn PDF document text
    • http://erictex.com/ufiles/files/nefoveloja.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_off0000c675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC675 10788 bytes
SHA-256: 704063ac509c968afa815dc1f228dd6fef25543a67791017ce253bb909e58315
font_01_sfnt_off0000dea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B2 21020 bytes
SHA-256: 07e829b2ee67cf6e660b3305cf2bc194b47d6e66bd906cf059167515d4e7fdf2

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