Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf4d3436e854951…

MALICIOUS

PDF

87.6 KB Created: 2021-07-06 15:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f0b5cd6c2030cc40aac947292bc8455 SHA-1: 17756819880d1ffee67534a382e9fb55506cd332 SHA-256: 5bf4d3436e8549510b9f1666eff930c9339ae599edc21b06c1992eb6b47c12de
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The PDF structure itself appears to be a lure, with the embedded content being unreadable garbage, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37059248d1---zanujixa.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609c67e5a835b---sogepesajizojatopirat.pdf
    • http://studiotecniconuti.it/userfiles/files/kegogu.pdf
    • http://alpha-th.com/userfiles/file/85067622452.pdf
    • http://dansensvenner.dk/imagesfile///dojetumokufumapezaxes.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/1730d0bb827135cde967da6d640262b8/novigadudilapobupix.pdf
    • http://www.deco-interieure.com/userfiles/file/27433601439.pdf
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/kixefidusujiwawawibudise.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abca71789b4---16821699470.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/d0e3bad9ce96d93c9dc20695c7d4be34/77294963458.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/d822078f87ca603468eb88dec206e5aa/morixapumawurimovuketisut.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/10fb879ed6eb7a64bd80e0d9109e1804/83513779794.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a17014ba7---64223508297.pdf
    • http://julianowka.pl/ckfinder/userfiles/files/45777869400.pdf
    • https://greenfuturevietnam.com/Upload/files/kifibaziro.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/2f5f8f02338d7d5299a953ebbf34887a/fipijexox.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098467aeea33---14443477397.pdf
    • http://jevades.com/aircraft/fckimages/file/wejurabozuzijuz.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160815f1fe4886---70207016799.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd7d83e6e9---dusewebuso.pdf
    • http://muntepa.com/userfiles/files/detowufusobelo.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/b0995049182121d56be95b45c7c0e8c6/jiseruraragubefasek.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=long+walk+to+freedom+review
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f343.bin
e379cc6a224846565415f298b67f5a4ec107a6c3a1e94a8c38a794826aa98e4d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF343 17472 bytes
font_01_sfnt_off000120c6.bin
f24113fff9d9dfe034f71a4a3d0d836e420edaf9f0df83883a3baf04809d1a4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x120C6 10732 bytes
font_02_sfnt_off00013946.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13946 16792 bytes