Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bbde63962dbcd29…

MALICIOUS

PDF

85.1 KB Created: 2021-06-25 17:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61df0de69777cc83f3d52ff5c2f4ccd7 SHA-1: b50b6ae070c976236a0c276f1b12e9ea1ed99006 SHA-256: 8bbde63962dbcd292ec27be1db2818e9b2371721c628ce1adf74297389f86cb8
216 Risk Score

Malware Insights

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

This PDF document exhibits multiple indicators of malicious intent, including a high ML classifier score and ClamAV detection as a phishing trojan. The presence of a 'Password-protected archive handoff' heuristic, combined with a 'Callback phishing phone lure', strongly suggests a social engineering attempt to trick the user into downloading a password-protected file, likely containing a secondary payload. The numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites, further support this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://chcial.ru/uplcv?utm_term=risk+management+policies+and+procedures+manuals
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe6483b5fb---rovodezorafiga.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3e4169b67---62033395851.pdf
    • http://associatedreclaimed.com/userfiles/files/vamuwe.pdf
    • http://hy-concrete.ru/d/files/tisolofexudapevu.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/59ijuurbcr066rskgj3oe2jb4bhbsrri/66950293815.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25e57ca857---mutap.pdf
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/qjpooce7l1bas9jkeh3ilg5tq6/nivokatu.pdf
    • https://steammining.com/userfiles/file/92326400659.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a2ad8b7dd---98782666472.pdf
    • http://lucann.com/Upload/file/58574169353.pdf
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/18872641040.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/fc74a3274b76de44e1bff4f518c2bab1/vetivufaxexutij.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/etdebhub8pugrn8d9gbnkg6uc7/93129861433.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a51a5ce4db7---32039985145.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/c791fr9a9ovmfkhmum39qiq629/73985451880.pdf
    • http://hotelsandmartin.cz/files/file/1556878789.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/2cb33e87ad2e9eb3109fd9e930eb9bfd/jofonoxode.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722c16ebc95---45274675788.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/6df8a4ac761eb38b3be0e06afcf7ad0c/rejogelomefikubatatado.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/9695a79ba1f1ece76aa835e1df03502b/11153246194.pdf
    • http://terralis.eu/catalogue_dynamique/file/tamupajijirakowelu.pdf
    • https://adepotcustom.com/UploadFiles/file/20210514234338117.pdf
    • http://nextgenship.net/upload/file/20210521162160263813.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160728810e94a1---rawajuzefox.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd81f94ca5---78910828314.pdf
    • 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_off0000e92f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE92F 16792 bytes
font_01_sfnt_off00010141.bin
80db28f021680f83cad2fd9c89d0d238dfb354887a12e99c817607938357866b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10141 16924 bytes
font_02_sfnt_off00012d13.bin
46aa83c7069498c21879c30569fd024f8499daaf66053f9402bf4758920238e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D13 11092 bytes

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