Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca478cfa24e10083…

MALICIOUS

PDF

87.1 KB Created: 2021-06-25 23:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7b406701343bf26106436fdc3694381b SHA-1: d4a45fe4a2eebbbe998f3abe215931c09fa83ec5 SHA-256: ca478cfa24e100838c53c77e57e554456f075facea1444873148a73b5d81c5e9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is classified as malicious by ML models and ClamAV, exhibiting characteristics of a callback phishing or tech-support scam. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or redirect users. The heuristic 'SE_CALLBACK_LURE' specifically indicates the document's intent to prompt users to call a phone number under a pretext of urgent financial or security matters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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) 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://krisoc.ru/uplcv?utm_term=does+box+hair+color+expire PDF link annotation
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/98a4bd67396a6f04b6bb271bb90a349f/vaverivitumuzunun.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/4ef7670c7935fc7ae75fe71b4d5e9fb1/43564252083.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/ganodivideginawe.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/51362442522.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/zokixiwaputolibapeb.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16070406030d97---jitiwuw.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/28355107908.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99c7b985a4---32332454376.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/5btpemi26d7r3er8rjhegibomv/gikeliduxewax.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160935082adc54---9913904353.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/7e67oc5pf35fqepttgcrgghv95/jagopinadaxomapani.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/wisoxojisorumerebubimawum.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608460eb2cf6f---50765447314.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/92990833965.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/j7qo1vdecu1ulvg3gr3nhd0p30/nalopepaman.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16088543a13142---81254404860.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/vizabasomi.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/25a9ff13e4aed0ca1e2c5c2ad680a84e/suvoji.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160833878dfbab---lodewivemedolaxakikuw.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7985115d34---10682830354.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/11e3ccf8e51c21627cac79ef1b831fec/33734475010.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_off0000f125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF125 17560 bytes
SHA-256: 934f5b3ca5ec8e572720c2a1ea1835a1f87a78002e439e53ef878f24722b0c20
font_01_sfnt_off00011f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13781 10512 bytes
SHA-256: 43996d3fc537af808b53d55c77b20f317cc7fa230386fb635d79c328dd553fd1

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