Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c59ac30a0efc34d…

MALICIOUS

PDF

87.0 KB Created: 2021-09-02 16:35:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f31bf545a8a79609a3f98ec018b13900 SHA-1: 516b7960d050c1f4bd67311b36c99cb9f32ee7ca SHA-256: 1c59ac30a0efc34de5c196eb7de23fd9e77aaff8b1be99363027cc814d1bcdbf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These links are likely intended to facilitate phishing attacks or distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://cructi.ru/uplcv?utm_term=petrushka+1947+score+pdf PDF link annotation
    • http://52fotki.ru/ckfinder/userfiles/files/13492211875.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/7d10435da1cd6234133a084222b9acde/kafafapojonava.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/77793519792.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c032b4f2a---majakugowojenuxorar.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/59335501002.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/joduxezu.pdfIn PDF document text
    • https://zd-zeta.com/uploads//files/202108042228478112.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/28763967039.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/jugubemofatosipawojerosi.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202107210409228804.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/kiwelijum.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/38378450861.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/6f1f47787adb375ad1c8015c7644c114/gisusekariwuwomuniv.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/78911072080.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdced288c9a---42330444405.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/70747324355.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/kamutotizozogadiwibima.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/96582885905.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/1d9jd1jdes0piv9ff1u4nm870c/ribamugonakopuwuxu.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/revotidu.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/fetofojovobebulewaso.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/23311640046.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/69649855690.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/h772hfqo2daaqqoohs9equsaf4/55545830508.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/dakefunajevenolak.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/14038906189.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_off0000e64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64E 11016 bytes
SHA-256: e4937d75c9b708a1ccbe327a7be804143fe0ff31d7a365f9e465ba60743b3d67
font_01_sfnt_off00010041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10041 20320 bytes
SHA-256: 8549ceda478cc58884bae7b16ec6c298ba8afdeac9bee69407d1fc36015ddebb
font_02_sfnt_off00013554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13554 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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