Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c7df665e8db5664…

MALICIOUS

PDF

104.8 KB Created: 2021-08-17 01:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: afc3ae3e618e8b87722757aa4168c1fd SHA-1: 80a6eebe98e25270aeeb0a7a9ec3aa784e4b1d0e SHA-256: 4c7df665e8db56643a781cec29b6935e74c1b69e6bc45fe4187def1d1a9636c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF structure itself are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/12388925473.pdf In PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/mezaziratumebirilodogi.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/d6ad4227247aebbe3cfd6426b8e7e3bf/kavok.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/jokevefolukarugelaniz.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/0l22qql8nhrtl10pe35329pvlf/35701419471.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/1ppg4ots9blq6q4f5i13h7mi5t/8153348550.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4a03444b85---fexipotofalugesim.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609859bcaa6ca---96286477728.pdfIn PDF document text
    • http://ahchala.com/img/file/93624298250.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087284629854---52645422395.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/bedojaderexafejosikuz.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/79022438779.pdfIn PDF document text
    • http://goref.ru/files/file/javupadaboburaduwuboti.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac89c471778---70220077332.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160878ed27b0f7---59772122315.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/23273922534.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/lilixotogu.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/desetufarake.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/fupupasapiwomuxenur.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608735264e655---39185225702.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/jadesa.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sanit.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/29aec7e605d95d0d79741d3d34fdeaa5/sederiwafobifubiludasizej.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/33129837288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=pediatric+cardiology+board+review+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13626 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E38 17184 bytes
SHA-256: 5da25695a6850ab2d5a75777db6b58c04c4f16347971ba90c0b7a09fc31a4254
font_02_sfnt_off00017b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B0D 10928 bytes
SHA-256: 5e9d303734153e390f7137f7dfa3e856b384766edee042644cfde9182dffc9b0

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