Malicious PDF — malware analysis report

Static analysis result for SHA-256 b87eb6fe04a5b30d…

MALICIOUS

PDF

72.5 KB Created: 2021-09-20 05:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4ce3fa01c2fbef50c8988e6c38714271 SHA-1: 1b7469d1b312abefd2fe5a3db2c87d0439bab882 SHA-256: b87eb6fe04a5b30d1615efafcc88d7d29797a52e67cf08a0ee2bc9c8d064abd2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm designed to obscure the true destination. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, where users are prompted to call a phone number. While no scripts were directly extracted, the ML classifier and ClamAV detection confirm malicious intent, likely involving JavaScript for exploitation or redirection.

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://medvor.ru/uplcv?utm_term=love+tester+android PDF link annotation
    • http://ovstav.cz/app/webroot/files/files/92003458714.pdfIn PDF document text
    • http://dejede.com/userfiles/file/21201163926.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/a71a7764af0b0946451d399212bc1a3c/jivazobenapat.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/sanupilasobulowalad.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/58645789406.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/73492960781.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/23139130052.pdfIn PDF document text
    • http://onecre.com/images/content/files/69311498507.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/60166698531.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b972224f2---gezukosomadiluma.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/46749876777.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143120729d2f---39607407879.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/mepebaroru.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/dezabejuvojaz.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/14775470038.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/walepufebeposav.pdfIn PDF document text
    • https://somogyplusz.hu/files/54795216879.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/podixusirinadorip.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/5a9d21a1b3be1db497bd38a4b0625994/xazedapamuxamovifimafeku.pdfIn PDF document text
    • https://paintingwithapassion.com/nbloom/fckuploads/file/pisevido.pdfIn PDF document text
    • http://househouse.it/userfiles/files/36769123503.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/24970756258.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613352489718a---4763671403.pdfIn PDF document text
    • 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_off0000ba06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA06 10216 bytes
SHA-256: 65149524018c4537526a2c2ac6516d9150f06056807d63a5b268a8cd45ba79aa
font_01_sfnt_off0000d11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92C 16548 bytes
SHA-256: f0de123f47fb25c17561ede6de48955fcd1b32906c7f2c54bc87ada6359cc290

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