Malicious PDF — malware analysis report

Static analysis result for SHA-256 b82f0a4480b30578…

MALICIOUS

PDF

85.0 KB Created: 2021-09-17 18:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d5a6fb1eac2d5ff863f30f78c48d97ca SHA-1: cae31dd322d06e189a13c39c50c7d7eede5af742 SHA-256: b82f0a4480b30578f979e1f0c962fe3096133bb6c68ca5c7a4cdc5bc36a4bee6
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document body, though truncated, suggests a callback phishing lure, prompting users to call a number for issues like billing or security. Embedded JavaScript streams and numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicate attempts to host malicious content or redirect users. The primary attack pattern involves social engineering via a callback lure, likely facilitated by embedded scripts and external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/43cc9495f4b4f760a45558c6c77aee71/jikiwovivozoxolujo.pdf In PDF document text
    • http://www.jindatunnel.com/up_files/file/tivuvinubiderovasamodif.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/74949983530.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/10108514906.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613384019ac18---29812477526.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/62150837023.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/5492668305.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/68617972868.pdfIn PDF document text
    • http://katela.net/userData/board/file/10972476170.pdfIn PDF document text
    • http://didula.com/img/file/gipemegeluwetizogin.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/a83cd71cda5ef73be8900751ffa74d8e/56900600990.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416a29dd6a9---36966872521.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/99397035213.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210904130355.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/7c9c7ac633208057d07e7e43bb08ab21/legibiw.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/gorenakurisawefu.pdfIn PDF document text
    • http://all-premium.com/user_file/files/weropov.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/b1147b0f6f8172438c02c3450075dda2/81931325678.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/28102890672.pdfIn PDF document text
    • https://windscrm.net/files/file/xeruvulijamadejej.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/64768664305.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/fusunefobujaserojavaxo.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/20091051489.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/mibaxogogorebulat.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/22190298241.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=using+a+phone+as+a+security+cameraPDF 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_off0000e782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE782 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF94 17504 bytes
SHA-256: 1587bf8e32548ebd7f62f8dfbfefa045ad20a14bfa53123d4c5368db930c95df
font_02_sfnt_off00012ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCF 10996 bytes
SHA-256: 0ab9d5f7f00dcd2dc3784dec562b7dc91922551c83fc3c47610714fcac08e738

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