Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b40ecdd15f01e9f…

MALICIOUS

PDF

85.8 KB Created: 2021-09-03 03:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f89f538adea2054727ea396e0e1a1153 SHA-1: 6f36403f7b1e2c3fb87e8a6e4d8e13352c80072f SHA-256: 1b40ecdd15f01e9f16f761d7f535d3a38adc7b9ef63c721f45de7c5e1fd5b65f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://davaocarrental.com/images/file/pixojazomexizevanewarux.pdf In PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/liwuzalotuwuj.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab57ed6b6ac---93202781360.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/74000549838.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/8a0a0b6ff0461ebda896788c7c2663a0/zosutukozogoz.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/32767207971.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/22952157200.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/perefuxukapitanen.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/7c6eb8fdf3615edc1862f394c7e0e80d/romitavowevotasek.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/91370681282.pdfIn PDF document text
    • https://micsys.in/userfiles/file/22872293149.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/4aqggai21j0ualdc2bgid7to0k/gugisidonewetiputuvafa.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/63614647038.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/41639156580.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/30394028482.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/1faaba9dffe7f5470165872a454684e3/8548264410.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088495937756---47961571608.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69df461c71---822131457.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/6e22a58a689d69bd132c9aa3f9cedc0e/vegeb.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/guzak.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/zajasuvosamubemopepowisun.pdfIn PDF document text
    • http://cnp-inc.com/ckupload/files/wazagefinutavopoditogemod.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/52220865698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=kali+linux+hacking+tutorials+pdf+downloadPDF 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_off0000e32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32D 11136 bytes
SHA-256: 288e5ca3514864870d00c6bbefe69ff212ee5d2dda6d457965d305acda5c1ad9
font_01_sfnt_off0000fcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFA 19624 bytes
SHA-256: 42eae0d582066c288df5b573ddab1ce7c3b4899394c7e9a9ddfd5e060297414a
font_02_sfnt_off00013124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13124 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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