Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf28aa1d576198b…

MALICIOUS

PDF

82.4 KB Created: 2021-09-05 06:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a1bf6b08e507a5b1a875c96c88f12f81 SHA-1: c54c8c8dbaa99e0e3e2570c7b5a66efbdf1f056f SHA-256: cbf28aa1d576198bea33711ceb101359a7bc3ec57f37b3e6cea950118bce6e3d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in tech support scams and callback phishing schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://synerhu.ru/uplcv?utm_term=britax+b+safe+infant+car+seat+manual PDF link annotation
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a9551cba6---dorolomupapuni.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/bagara.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/7415b7cea41fb72bc81fb6c0b5250095/84690997005.pdfIn PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/kusukarufediguw.pdfIn PDF document text
    • http://iviltra.lt/images/files/5408588175.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/nixikoxokejurusu.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/8vjue14f2q5cqfq65t3leees6n/gofowuvomima.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/57857216740.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/h3kip7u7bh7ou23amjhvbab26c/musiwip.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/120001041663.pdfIn PDF document text
    • http://hongdacable.com/d/files/desulepixepatil.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/64173fb2746de5a7b1165561dec40c56/tapizakebafiboxikix.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e03991914---61497484623.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/db9c798ec1a30afdd714e3db28c6f065/kepiribibe.pdfIn PDF document text
    • https://mbbs.hr/files/juxapapajivitumuxadenadu.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/5289528252.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/3943681682.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/xeriwetatuna.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/samonukuxanutuwiguz.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/bapusasafa.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_off0000dd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD51 10772 bytes
SHA-256: 1efc184310bab414768f63ae5f704b59f1e804b9a2af534e71b44be46635b38d
font_01_sfnt_off0000f62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3F 17552 bytes
SHA-256: b4b4840f3305e59f76b5df2d3842bca72331c1fa6b9692ee37068a1e47a9afae

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