Malicious PDF — malware analysis report

Static analysis result for SHA-256 149e771813ee60aa…

MALICIOUS

PDF

82.3 KB Created: 2021-09-01 10:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2229358d35dbf5b92a544cd51722deee SHA-1: 919c2c8e12e01dbcba27971b2b100913c66af6e6 SHA-256: 149e771813ee60aad8c5ace26d38c4bec0c64ffa2a1fc05156fa0e5338a823e0
156 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, pointing to numerous websites, many of which are hosted on compromised CMS uploads or disposable domains. The embedded URLs suggest an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://automozg.by/upload/editor/files/15765714715.pdf In PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6f79c0f8f---97593437367.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/rofuxupaseduwetipa.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/vikoxozoxugaz.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/12520328274.pdfIn PDF document text
    • http://amdind.com/userfiles/file/74354633228.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/8765631224.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c33542590---sinuweboz.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/tuwelibazanabot.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607843e1db32f---pexusatalegulazij.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cfe3a9453---kekoxutezapovi.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/b2b23991a42ceaf3324ff8812135f637/65632699296.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/kufejokafenogaw.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210727160122.pdfIn PDF document text
    • http://consade.com/userfiles/file/gavidopogatafulanifetu.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/52229585869.pdfIn PDF document text
    • http://zenithmetals.com/files/tewanoxonilexubifilowaw.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/38832988976.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907da466133---jeruzokexa.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/73993974494.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070491326106---64254995732.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/wovunejot.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a038b4624---26949144168.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/lorapafomuwug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=luther+from+umbrella+academyPDF 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_off0000ddfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFD 10688 bytes
SHA-256: 714d7a07ac520a0f7ae772cc70c222b3eae41ed58e54e95bc5dbf8af696f84a2
font_01_sfnt_off0000f687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF687 17284 bytes
SHA-256: 4f853efe460dfb4c87df4d07e1f1f8174c1c566b347c274c4d6fb66fdb6fe03f
font_02_sfnt_off00012362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12362 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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