Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b444c826bb36bb3…

MALICIOUS

PDF

81.0 KB Created: 2021-09-06 16:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ffa91d76d18121f58d96616a0f2ac095 SHA-1: a3965c6806468efa8e8e85872f8371efe7df9359 SHA-256: 2b444c826bb36bb302cc53c893c5eeee0eccf1695ae3988007275db98da1ebc6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting it functions as a link farm. These links are likely intended to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://philabc.ru/uplcv?utm_term=electrical+hazardous+area+classification+pdf PDF link annotation
    • http://dj-venci.com/uploads/pages/files/nokewanoribo.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/57b083e69c75f3307e3f03de4abf24f1/majufigipumu.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/4ee4b601eb76ccb440ffb1b3bce946fb/rapofajomesikafofiba.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/dokixamejixaxibefoza.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/20657013651.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609cafc742fa6---61622684314.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/73818777853.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/naxelir.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/vavijedit.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/paviwusoxivax.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bd6407957---nonatedexixutatuvubej.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a63b92547be---76927671882.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/2f4fbd5175868e414ba82a6914114e62/50283497056.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/4dc702b6f79e38e49037e716bf8357b8/pizuvudovedazokuni.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a05e442da---xowexenisagovizelu.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/98285401121.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/83516895571.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/9041df8132f06da0b419d8c62c7dae5a/48197700830.pdfIn PDF document text
    • http://stylekd.ru/files/tivetom.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607ff4c918260---paxemogibugutijumoriga.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9d4e35c2f---pafaxugajixawisapeluw.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/99349128717.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/c060fb846995f3c4d4a4fc4f7d771d61/lefubikalikipe.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/jafabo.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_off0000d82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82D 17744 bytes
SHA-256: e8e1b8866addc6c97b4740e23e72b1466760bff85284abc3224e0b680289d4f9
font_01_sfnt_off00010530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D47 10860 bytes
SHA-256: f4a154b7ad4023d6e6406bfea8dece9c1e7381971559f71062e2d0ba420072fa

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