Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd616cb77308fa81…

MALICIOUS

PDF

72.5 KB Created: 2021-07-03 21:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f45a33e26d8bb5c0d992ac3407a449d6 SHA-1: b1cabde9c8b3909f3d0a47669c72c076dde9ed35 SHA-256: bd616cb77308fa81b74fb42024292aa4058ceaaa22b200e94a2b28c6c5496fbf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or scam attempt. The document contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic further supports a phishing or scam pretext, likely aiming to trick users into visiting a URL or potentially calling a number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=electronic+commerce+gary+p+schneider+pdf
    • http://poltinka.ru/userfiles/file/pezixaruwa.pdf
    • http://alexlunacoach.com/img/editor/file/67416368034.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089ddfdf0504---37449985472.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/3db16c68c2e11616c719c0255ba36453/35954489189.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943ed6b860a---99606253995.pdf
    • https://esz.jp/img/editor/files/zugoresamex.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16091d92a74cb7---72338861139.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/10e949b47df628afc17bb3aa47219f1c/bajakul.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/38057ef1e740ccb23fba96c92b7387b6/88233304198.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/334011bfafbe13fedffb8b6e7e114fce/53107610729.pdf
    • http://siripanyalamphun.com/user_img/files/38050277396.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/40b5aed06387b538c8c2a2dccae8a92e/fapatupeboj.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a72d54cc5d---guvotirululalu.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094e3a56cc78---kuxekadujo.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/380e25df464ef3e483766b49796b7b21/58017251079.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/b42295q648o39fnb4p0o13ulh6/bedupipipukojepajodininuf.pdf
    • http://innovatepc.com/userfiles/file/3586820955.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16096ff2186304---majokepugijopovexinasexam.pdf
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/52651083215.pdf
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/newaxubilesogosigefasoz.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/j1u8cvbm0ujr3q9dta4l7a7u4g/kubolujitobovigib.pdf
    • https://branchennachweis.eu/userfiles/file/46744718915.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160986e2cd4a09---92292853303.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_off0000b969.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB969 16792 bytes
font_01_sfnt_off0000d180.bin
f7d6e998e0fa36c569154cf2462e791490b9a22424e46caffbebef0809e96622
pdf-font-stream PDF embedded font (sfnt) at offset 0xD180 11164 bytes
font_02_sfnt_off0000eb2c.bin
b6ab413817c8facb09cf260188389ffac754e5cc591d20c5e8fd17dc043582ef
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2C 15920 bytes