Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e063c88059b1b73…

MALICIOUS

PDF

70.5 KB Created: 2021-09-27 02:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ded9a041387459d7ceb80338ffab171e SHA-1: 0faa628183becfb2b94e0a774a5d12a712256f1c SHA-256: 9e063c88059b1b73760d1edc8cb5c4c6b8bcfbaa9b2c5fec9b700db3a772dc9e
196 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 directories or disposable hosting, indicating a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these redirects. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structures and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://vhktn.at/images/content/files/gopol.pdf In PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/dk1uvf7bj354mbsee3t7nkmqn0/dalopunepozotesimunaferi.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/51645259113.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/19562465526.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/zadizat.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/93226181667.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/kakubekawu.pdfIn PDF document text
    • https://ms2oke.com/contents/files/losobejato.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/29374229743.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/28127769966.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/rakipoputopubo.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/tuvoko.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210927064201.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bf0aa2844---lesoxojo.pdfIn PDF document text
    • http://www.bandungmesin.com/file/wozawazelenufa.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/5f1seg38mankn79du4uluh9fvn/gezidivibo.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/94928626051.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/98415880661.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/mepilemokoveni.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/50177221120.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/vugunomolupulugeg.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416e3fc7e92---mamig.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/42a3921393327797ee0176cb4666a99b/pifofaburutekoxosumurawi.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/viturabejokilinovim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=streaming+stranger+things+season+1PDF 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_off0000b331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB331 10636 bytes
SHA-256: a8069a60e4310f4e256d142f9016dee877b36a24002774358a94053d17c908e9
font_01_sfnt_off0000cb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5C 15976 bytes
SHA-256: 85cb3009b221c1345820c6650c86c0f75f90fb531df090893810af20cc9182eb
font_02_sfnt_off0000f3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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