Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0e1b72c93bac6e3…

MALICIOUS

PDF

85.5 KB Created: 2021-09-01 13:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 08c42f44840ead8a6922c4941b85b3f9 SHA-1: 4ddf3f8d728dc70b51896baa44d913796436fce4 SHA-256: c0e1b72c93bac6e310ad981752ebf0d00f660dd66b784ab92861bf20603a46fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The document body is heavily obfuscated and contains no readable text, but the presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a clear intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d935a0d6f9---kepuxoxagazupe.pdf In PDF document text
    • http://fairmonteast1978.com/clients/71195/File/17919529809.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/b31cb9456a5c976a3e7bf7df4f6f2998/63268136972.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/zuxezomolivoxilaloruki.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/85670393251.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/0a90a1060ee8eaf1c288d94a776240af/81950390029.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44dc412eff---kuwepaporudopipeto.pdfIn PDF document text
    • http://cdhsalumni.com/clients/28864/File/79039465439.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/c7a1047d0e0ec9a7c2fd6cc2de1dff4e/jujabesi.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/88649330516.pdfIn PDF document text
    • http://cbstav.cz/file/43072490534.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/minekemilofowijedorur.pdfIn PDF document text
    • https://lifeteacher.tw/uploads//files/202108080807062794.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/67376180671.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092a1279962c---baribadawu.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/jusikab.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/88513650058.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e060e610ca---tereteni.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/telimuvakusov.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fb95e69c331---29343265728.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/737fb0a8c0eca8f6fd3d2ddffbeb969e/dezuf.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/b7f37e94d143e66d95d1fb9018f81f2a/masedojixunowomivowej.pdfIn PDF document text
    • https://o-dance.com/upload/files/4780969639.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/7925118bd1be0054815ac8aa5a8ef770/pozilawo.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/d586cbe61481e00c5547cf8cb29904d8/piwamerikepigikoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=omegle+girl+common+interestsPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB52 10436 bytes
SHA-256: a3214c282e267eb5178f639d0c14eb7b62f1408dde00a7876da8ce11bee611c8
font_01_sfnt_off000102ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EF 17136 bytes
SHA-256: 9377cb74571194766a93f61d00cd8a706a92a3150d09357e4f9845d9aa8c6850
font_02_sfnt_off00012f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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