Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c98bcb4466cad7b…

MALICIOUS

PDF

84.6 KB Created: 2021-07-13 20:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d28c3907df0cb230eca141a9c1aacf0e SHA-1: 71a0ebd91c8e2dbe1a71620b74f6401dca61acfe SHA-256: 8c98bcb4466cad7b7e2479792c640f9ffadb04c0a61c8c7bf739fa4c9d110c64
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it contains a link farm pointing to compromised WordPress uploads and a callback phishing lure, suggesting the user is prompted to call a number for support or to resolve a billing issue. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to deceive the user into a fraudulent interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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) 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://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091aba0ed05e---jolozugubekidaza.pdf In PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/8967841a0f875de6b27ed73953b03577/61661263110.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/88786511220.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/67072633807.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4f4a48d98---lisevusabebetexazinage.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/320604235e299ab4bd60d02b9d3314af/28761027214.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb229b64ceb---94592115659.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cf073349b---gokajeraduke.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/70997930083.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/88df4149dc32b5a67454d6b90fa4a212/xevufikejuvivad.pdfIn PDF document text
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/dazosal.pdfIn PDF document text
    • http://hongdacable.com/d/files/3779950277.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/448b8fa9d65f637987985ad97e7ce999/942281545.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086fe6bb723c---15357305217.pdfIn PDF document text
    • https://istanajp2.com/contents//files/ledupuwuriganutirobageji.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/tikidakewetafevexat.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/pamez.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/2e062b513697e5d74e2f32562df0f0f3/595349031.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/915c44e4ba93a5cd0a81c893d6810db1/bomosowoz.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/7a138cc7e8513e384d6913d039618d56/58504278010.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/af6f92796a79238be3f5ed158aebd13b/motopavemenowezilurepam.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/540e88fc74642e1610cd9a95f20cb014/wojabuvok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+delete+pages+from+a+pdf+in+previewPDF 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_off0000e59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59B 17604 bytes
SHA-256: b1eb99012fed23c772f887b978abcaf8d7463029b9bd95c068cc9676fa73ea74
font_01_sfnt_off000113c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD7 10984 bytes
SHA-256: 73fa617ab8ff0ddf795f53a102758754e197ab4a897cb87185f4b9a3fc161950

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