Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fcde7e7b5cc52e8…

MALICIOUS

PDF

87.7 KB Created: 2021-07-21 07:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1c6483653f340496ffcac203260f7596 SHA-1: 2193f692a0b460d68ff5a8ab9fd2165c18b830f4 SHA-256: 4fcde7e7b5cc52e8b3baf3442693d5368a821e1210e7893a9c671198c3cae7ee
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, some of which appear to be compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pusancard.com/userData/board/file/97450060252.pdf In PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/3bq9rlm52ve119qb27n4t08qn3/suxawasokixa.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/7062002320.pdfIn PDF document text
    • https://argumentua.com/i/file/fopavuwisorowe.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/3e62993593c158403d15cdbacdbaf3ac/toser.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/34936842107.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/19528036193.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/kesaxedalegetujaralosapum.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ec52c429024---30294307776.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/kalimuzagovuwonireb.pdfIn PDF document text
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/sumizexigolibe.pdfIn PDF document text
    • https://brakos.it/file/wivuzalakiwupedo.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/5b14aa96d038383b34f3a6c87247ab03/finavatutovikanasi.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/viwojitebulogedexidapal.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/74224074145.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4d353dee6---18216950825.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef60c7595f---tafizumizakinozo.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/xelufubajavawak.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/xusexukibagamubudusakar.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/85916922985.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/rezawajuzifodoxoragixu.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088bbabd3b8f---darumupuvox.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/5f7172ccd82034d835015e87822f82d1/sosakiwofumifedofiguvirax.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b63d650c9de---toxafom.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/keputagiwaxelukododipize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=dh+lawrence+figsPDF 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_off0000f485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF485 17396 bytes
SHA-256: 59ac0b2594de522116723a16c1f71f27987b8154908c32e97bfdbfcf047d0e80
font_01_sfnt_off000121cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CB 10484 bytes
SHA-256: 4aaa3f8441d3298b1126ed444f06a1282c82a2c3e1bdf21a3556759252d64a87
font_02_sfnt_off0001399a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1399A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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