Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b3c5d380dd848ff…

MALICIOUS

PDF

79.0 KB Created: 2021-09-09 12:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b2a999785b93daaf3e7194bd628d8ed5 SHA-1: ef13bbd4b0ecea7f208f3b00922aa60c47859e33 SHA-256: 9b3c5d380dd848ff28c1f2b86e422a6eb2416a837c82fff19807ad94a5efad8d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URI heuristics and link farm indicators supports the conclusion that this document is a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://mirutte.com/newsfiles/files/94846920158.pdf In PDF document text
    • http://i-dron.cz/data/file/bisofifodexapiwatam.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/tosadujelu.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/7513121180.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ibt9l3ni7nsbp6puglaod82pba/simiwonuruxozodubadazege.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/gulobiripubodifakawave.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec96b2419f---79731950135.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/tutajefubazogob.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/mamojepulapitebopow.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/19506419414.pdfIn PDF document text
    • http://theponghop.com/upload/files/79745293055.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a36f25149---diwuzomotib.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/zegepososetanirunit.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/kurixapadutedoraxabis.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/pobuwatejamorem.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/10929549464.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/litimigobavido.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/94f280045c4be86d11919f7fb6cfdca0/42464454815.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/99088723862.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/berasu.pdfIn PDF document text
    • http://ministerium.pt/files/62486035028.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/198019589961319400a99af.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136031294663---97684254751.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=duterte+games+free+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_off0000cfa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA9 17836 bytes
SHA-256: f5592cb1ab208708cbc84b8357507767797d631aad5321f89c0adc71ceb3a7ad
font_01_sfnt_off0000fd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD48 10792 bytes
SHA-256: 6d8eaa9dcf5142acf4c03f016e6418c55c0068c9206a1db5a10a4f1510285936
font_02_sfnt_off0001160a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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