Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc7d096fb1807c3…

MALICIOUS

PDF

102.7 KB Created: 2021-07-03 20:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bca5361ae0d725bdbd830e153889a2e1 SHA-1: 33c0aebb0bd10ebdad483e6ad599f6c3bd5dbaca SHA-256: 6bc7d096fb1807c310a6eabd83df49531a8c11b48ec5e18ed15ca37c12ba3fa4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various PDF files hosted on potentially compromised WordPress sites, a common tactic for distributing malicious documents. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to prompt the user to make a phone call, characteristic of callback phishing or tech-support scams. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://abacusnancy.com/userfiles/file/domowunewi.pdf
    • http://alessandrobelleseveterinario.eu/userfiles/files/5135605500.pdf
    • http://yuhenganquan.com/userfiles/file/20210702002801_1168091627.pdf
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58313157714.pdf
    • http://kuppersbusch-center.ru/uploads/files/jasujutikimap.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be22b86f838---zojepivanegobolimopot.pdf
    • https://poolpoint.be/uploads/file/sabazipar.pdf
    • http://files.ibiza-ferien.de/file/82775781647.pdf
    • http://biomassasia.net/data_ed/userfiles/file/68693297684.pdf
    • http://mitsubishilongbien.vn/images/ckeditor/files/nazar.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4297abcb0---pezejesola.pdf
    • http://cuatudongsaigon.vn/uploads/files/41611966988.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160869db9051d6---77247651034.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/d15512fe426f4c8bc5d1f943d9c90b24/goxijukezewif.pdf
    • http://videofilm-tv.ru/content/File/tagaturokewoxidewomevip.pdf
    • https://espaciocultivarte.com/ckfinder/userfiles/files/46532363782.pdf
    • https://psystat.net/candyticket/uploads/page_images/files/vaxapa.pdf
    • https://evermoral.hk/upload/file/1624965439.pdf
    • http://www.agenbenangbandung.net/file/tukizekaxuzisepexeme.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081aba81e5b3---gukalunetilezaxiwewifodi.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609693824193c---jojageduvexudur.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9926541026---fijalekejowijuxozujudozo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=one+pound+wings
    • 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_off00013153.bin
d392484dfe9b661a202770240f8acf9034823b06a8caeaee7eead19d0ca1937e
pdf-font-stream PDF embedded font (sfnt) at offset 0x13153 10372 bytes
font_01_sfnt_off000148b3.bin
e59e8e6415b83eca6d545aeac37e79d5e5b495622af272967382c01c728a1849
pdf-font-stream PDF embedded font (sfnt) at offset 0x148B3 17476 bytes
font_02_sfnt_off000175e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x175E8 16792 bytes