Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2e706422b547bd0…

MALICIOUS

PDF

105.0 KB Created: 2021-07-03 05:41:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e6f2cdc8fb8fc733eeec4e1fa2979098 SHA-1: dff1a5ec6eaa5a24f34f1308a57c4fa6ce674da0 SHA-256: b2e706422b547bd0ca80cf97194182af51045ec46656903e7156604e430301cf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm and a callback phishing lure, prompting users to contact a number for issues like billing or refunds. While no scripts were extracted, the presence of numerous external URLs, some hosted on compromised WordPress sites, points to a phishing or scam operation designed to trick users into revealing information or initiating fraudulent transactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • 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) or Microsoft license-boilerplate 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://inwebjor.ru/uplcv?utm_term=charge+of+the+light+brigade+reading PDF link annotation
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e2ca2e62c---18564835666.pdfIn PDF document text
    • https://europartner2.pl/uploads/78237573326.pdfIn PDF document text
    • http://ozari-ua.com/files/file/kasirojite.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082be32b23b4---bilujumagatujamojibojeno.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/5ce7b83001bdae51f6eed2aebb65f9cc/3103612661.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/5b0715b3d3083c485fcbfcbb1c751edf/fudupalejiwuxifetegusap.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/fd5vd69nh5gkrrak6lq9ul9aso/retirapovotubaride.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa614427bd6---12759886144.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d9c0652d4---nuwelem.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/67239170496.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/murupizotip.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/sabofaseladugomopezasem.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/344e7fcb1a34ea8dbae426fd12024a07/29055191434.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e006a67446---kokuzak.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/1h7q5jkh02kupm41a51i1pvmmi/tazijikemekewevevajeriw.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/0qc0ofd70laki08hlan9nsik9t/77717595550.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16244651298899.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/f3626d9c872607b68e1c2473d7ef03b1/sumezoxowivaziluxusez.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091c971b19c0---12361689411.pdfIn PDF document text
    • http://mcleod-bobbitt.com/clients/64742/File/narigoganajinaralumo.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16091f802778b7---widizadafapaxebuwefezab.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/57e0d951fffb8603ae14e46867dcf609/xumuse.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/27d7e1cc87a6542e4a0eb7291cd554f3/katunetizumiluvuralen.pdfIn PDF document text
    • https://luminex.pl/upload/file/jogidovofamogavuretiz.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077d4bb6cef4---milikizaxitepakaboxaxabig.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_off0001388f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1388F 17576 bytes
SHA-256: 338d7dfaf61090b80dbd31a12ff9f0cc5def2dc196a0a6e71a82d23cb79bcedd
font_01_sfnt_off00016677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16677 10636 bytes
SHA-256: a913d6e0fadab335a9941d42f62c650ad5eea3b2e7d0c02fc73730d9f0a1bca4
font_02_sfnt_off00017e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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