Malicious PDF — malware analysis report

Static analysis result for SHA-256 099bffa8accaab0d…

MALICIOUS

PDF

83.9 KB Created: 2021-09-16 11:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 440feca9428f0e9eb9e198473b3cab59 SHA-1: 9b8764bf69c10d3228b61417dfad35abc7833f43 SHA-256: 099bffa8accaab0d3cd7917c913f8ce340e51b95e54d92deb30af19fbc810ece
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple links on compromised CMS upload directories suggests an attempt to host malicious content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://tsradviseurs.nl/mailing/images/photo/file/10959647563.pdf In PDF document text
    • http://findingthegrey.com/userfiles/file/45766279065.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/famoromikepitexaxemavuge.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fbf30287c---62992849210.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/5377308075.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/zitesadu.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/diwoboluxeleronuxixage.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/xaselivobofexinaratowoliz.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/26588392503.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/tokabonozosewidi.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352ada3e398---riporajowududiban.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/67440956976.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/29963813766.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/11002479685.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/zufulubalutonukivun.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/siwavitulomijotap.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/39351207643.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/70149309019.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/29162596334.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/mojilobafakebosutimupu.pdfIn PDF document text
    • https://tkbhanna.com/ckfinder/userfiles/files/tuwamimonamax.pdfIn PDF document text
    • https://ismart99.net/upload/files/vegokexumabugezafogubigox.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nogudalujefom.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138aaa98cf04---9947351441.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=types+of+discourse+markersPDF 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_off0000e218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE218 18104 bytes
SHA-256: 6c4ddf580e9dd5a3256edbc2575f77c5a75c7dc6ab0119a744ed9ca8e494f0a5
font_01_sfnt_off000110fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12913 10800 bytes
SHA-256: c85fe77f93520e341eb6091654c7eb949961b73e13ede3e0571a9789c94fc594

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