Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c994d90dcac7b25…

MALICIOUS

PDF

78.3 KB Created: 2021-09-18 17:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9838222a5c41e464c61ec2dbfbe87d34 SHA-1: 57c7af411f5fa4456c22b1b2a85f0c83bde7881e SHA-256: 3c994d90dcac7b25e74e9e6f16161f780d7a2c7198a382ee6d4c955ef4e4090c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a large number of external URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://crysiq.ru/uplcv?utm_term=the+maze+runner+1+online PDF link annotation
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161329876def6f---16135601890.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/99483776277.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/97059836878.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/lokilulogani.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/wimesuzobe.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/e54b4463d3fb37e98bea62273bbd448f/muxisotejeguritakerimi.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/45713232363.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b17324a7a9---ninedabazova.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/bewomoj.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/gifokoxuno.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/31259105397.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/939480783.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210903081242.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/73426861901.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/xomizilifawupatemuxuvu.pdfIn PDF document text
    • http://spbi.cz/res/file/mulumolusigotoxugiwe.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16142940d2b4c4---42130473106.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/kotinumodosisomigepodavik.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133804d5b490---biroritabese.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/44089117957.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210905154711.pdfIn PDF document text
    • https://dm288.com/slicice/file/jojofodepudilij.pdfIn PDF document text
    • 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_off0000c9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EC 10280 bytes
SHA-256: e3411c0ebd7524e13bcd1128fe8e2ff5955eea6c619e36259e0592a3908bc06b
font_02_sfnt_off0000f8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D2 19920 bytes
SHA-256: fac04e5be2bea03dd990547214825f0bf8d0f52050b8eae6c591a16c25d2423f

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