Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb88e978c3c41b4…

MALICIOUS

PDF

101.2 KB Created: 2021-07-01 00:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 93684f5f63a56c1f56f9a69faff62d74 SHA-1: ed565afab1eff06149cff0ab5e5c15f80a20bb36 SHA-256: bfb88e978c3c41b47f3dc7edac3c3bc8a67ecebd73dee9ddff84918040a93e23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking direct user-facing content but containing embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

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://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e01bc64af---bujimibatoxefurabonabixi.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160917ef60efd5---91832483986.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/fqr273ovn5aloja0n96hbtlgbj/xarijirikaxuzugi.pdf
    • http://afgventuregroup.com/cfiles/file/tarizaxodibolabixukixi.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16076573f836b4---pivefososonaxi.pdf
    • https://sofupingame.com/calisma2/files/uploads/rebisonafifabolaf.pdf
    • https://airshow-bg.com/file/basuxojewizuxipinire.pdf
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/5c4d8beb37b1e9bbfa432899d3387150/vitapumoliruwopunarete.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/daea5f73c620d036f39c70f977562199/tifidatunujedizixo.pdf
    • https://amblamy.ee/upload/file/27163805463.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa700102966---lowukokabumogodilabonomit.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c1a875576---31609182810.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bac3426c1---96829441380.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/d7a4a597f3625cfa17d5937542bf1ec0/60187575692.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853041158f8---laronevanulekavejogojivo.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/58geiqqalleu3b230vmvao2kpd/59901719963.pdf
    • http://penzionklara.cz/userfiles/file/11960642647.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd01b4f7bb---palibaw.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/2v09jbbqkddsqlm4jdo2ed7hjm/60317620936.pdf
    • https://zlato-eu.cz/upload/files/gomawewojakazuvumukumax.pdf
    • https://people11people.gr/uploads/File/pefefes.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/dcf3c03f42dae244e48a00902940bac4/50569094654.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/b5004b7cb83215be394d17dd52645a6f/dixoduniwe.pdf
    • http://dhf-china.com/d/files/30625961757.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083611c75042---zijufutuzam.pdf
    • https://chp-travel.ir/data/file/90712803292.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=movies+with+good+acting
    • 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_off00012446.bin
1845286c301563464d84b9cfbfd7ce620b29625758d828c02ba9781e9f4a50ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12446 10648 bytes
font_01_sfnt_off00013c80.bin
2950d4fb3092daf0cd8046b974fed8e79d7ddda3044ef1c2b0857056b1ff093c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C80 20156 bytes
font_02_sfnt_off00016f8a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16F8A 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.