Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8130aa48fddd7db…

MALICIOUS

PDF

73.0 KB Created: 2021-09-08 02:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cf48a71794e181b9d860179223abedfd SHA-1: a44a7f2793d410dbeb8a7f964bcb7feddd2ac283 SHA-256: d8130aa48fddd7db6858adf8cf51f5f41c0592a3d7f4044ab95e4df3fdd2fac3
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using disposable or compromised hosting for link distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://aspaeng.com/files/image/files/24626119357.pdf In PDF document text
    • https://nhorizontours.com/userfiles/files/fafojopabizideru.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/293720554.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/930591239a36ff527e2456339692b11c/pefulubomuxa.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f501c6b07---sosusunonavivuwimarep.pdfIn PDF document text
    • https://kede.org/userfiles/file/61107273922.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/potaw.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/g6kfgjv0n3cb9uu99rrb2ik6bo/xomesibuxa.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/nupofurojanakerofufasixek.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/82493969487.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109071148346287.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/fanolipojenutu.pdfIn PDF document text
    • http://harveyfamily4016.com/clients/5/51/51a16c7d09a65bdad6d3cd8ef7da6b4e/File/41365585654.pdfIn PDF document text
    • https://parfumzone.ro/files/file/zakoxato.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/24980115536.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3bb44ef8b---pibagijeso.pdfIn PDF document text
    • http://cosmickino.ru/sadm_files/danasegapulifexegidisuw.pdfIn PDF document text
    • http://zuche0551.com/upload/file/59869190074.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/7972458574.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/31947012782.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/kutanobobomodijalivesaxam.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/lekatikimixizatujafes.pdfIn PDF document text
    • http://vce34.ru/attachments/file/widazagajumowu.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210819_205230.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/71946efabb79c870f2109bc130cd98d9/fubukirizirodiletawaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=parasitologia+medica+de+tay+pdfPDF 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_off0000b913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD125 16928 bytes
SHA-256: 6d752952d0112e5c2c53d3c5afb7446fff662b38c6746a04521a176bebb0d506
font_02_sfnt_off0000fd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3F 10976 bytes
SHA-256: d9c0040042b58e65588790a76ec6bab45586e409ca69fa55a51637f2c08352f2

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