Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba90cf4e89cad19…

MALICIOUS

PDF

85.0 KB Created: 2021-09-02 10:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 12c429ce6ae6fafffe1ef7ecb21046e0 SHA-1: 91120c68ccef85d07002d157ce5481a28bab3b2d SHA-256: 8ba90cf4e89cad19d885822122da355d938002d4cd175c34a9069e9b2294db11
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. The 'SE_CALLBACK_LURE' heuristic indicates the document likely contains a phone number to trick users into calling, consistent with callback phishing or tech-support scams. The presence of numerous links to potentially compromised CMS upload storage and disposable hosting suggests a distribution mechanism for malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://quickvideo.nl/userfiles/file/pefixebupaditoz.pdf In PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/95bb6e968eb0d186ee0392ab20d267e9/musopajofalawukagixati.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/jrmnqt77hbrt5he37qv0hsc6b2/sufotogolimalemerifojep.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/45526922397.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/13l2i3jc3hsp9usqlca82up8si/reriba.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/99120926202.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/74611914964.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/60na23jrnf7epufc793gig6is9/fogumo.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/l3o5ism0np4ho1a9kteh93jrf5/safojanozofejevugid.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/vuwutinuvefepikisukajazo.pdfIn PDF document text
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/rofadotu.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/37202021208.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c567158f762---17768173307.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/34237877468.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/24044994286.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/2f2c980a42557f3cdbfdf8a5bfaea58b/42674467430.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/85843234254.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd967907eaf---70934989461.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/35111194501.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/5cip98s6abf8bvancpe85bn7fe/76006432927.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba47e6d4c4f---97061423754.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160b450208e089---zubodere.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f10aed0b37a---nokedufarutubivagud.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/1cee4ce9a391e95b89e3d8ec0ddf9d40/15452562727.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/21868033047.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091991d2ec0b---66188422313.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/94472100963.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608118dc567fa---1702369.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+civilization+of+the+renaissance+in+italyPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BA 10636 bytes
SHA-256: f8d0987a8995a75bf7fb6bc2f0b3bb2e394f05e774e6960dc23f2c4797c5676c
font_02_sfnt_off00011c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1A 16172 bytes
SHA-256: e7f7bab232d4fe59372f6b3d692b31b8d511713a5c5d1cca7f17434d5972b29e

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