Malicious PDF — malware analysis report

Static analysis result for SHA-256 132b25e17b65102b…

MALICIOUS

PDF

81.4 KB Created: 2021-09-08 16:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 32f0c5282be174b80c41720faf3cdddc SHA-1: 1ac71f1316c6864fa4705a347c54be581c97c2ec SHA-256: 132b25e17b65102baf165581ca3fe5ecab8ff680f62051a4c4107d3633690641
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to redirect users to various PDF files hosted on potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's part of a campaign to lure users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://antropolog.ru/userfiles/file/zawaluzewad.pdf In PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/xowovuvewazopivekovok.pdfIn PDF document text
    • http://vaithun.net/upload/files/87607798531.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613710225e7cf---begotubaruzuloban.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/26895626985.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/67827866939.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/4709857193.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/65637729882.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613763c9ac8ad---7898743423.pdfIn PDF document text
    • https://mollis.rs/files/nazuboporatud.pdfIn PDF document text
    • http://isitekmuhendislik.com/userfiles/file/bujefitukavowekoken.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/48123192775.pdfIn PDF document text
    • http://sabaparsian.com/ckeditor/files/files/25914553716.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/66814721218.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/bodovoneporamone.pdfIn PDF document text
    • http://thegioicamdo.com/upload/files/61451878455.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/26068351194.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/85674821937.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/nijadigumisamoj.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/barofujemusoxibitan.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318c99b3611---patukedel.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/72931431588.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/jotolimefafamoxenanamotuf.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161374f454e479---pamiwof.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/d1hfr6rhbb2ve3han7qngfa1n5/retemo.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/98332165837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=download+pdf+books+free+urduPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/pagazulaxakonata.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_off0000db1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1C 10720 bytes
SHA-256: 3534cc9dd4ffc8b492b852320af63eee044bf5d6dd79a65bdddb6df69b6021b0
font_01_sfnt_off0000f3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AB 17020 bytes
SHA-256: a95d7daabfdc6bab42add3449f27b7eb5f2a95e366a88a6e412cde1ae30c8851
font_02_sfnt_off00011f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1