Malicious PDF — malware analysis report

Static analysis result for SHA-256 c87ae149f08adfd2…

MALICIOUS

PDF

104.7 KB Created: 2021-06-30 01:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: bc4500fb8f492e6a1c980e9e60fb7b17 SHA-1: 532de4075de9b2f2b4543516896738921675f18a SHA-256: c87ae149f08adfd21065e37c0843cd24aac109d1d3a3984fe36f0da9ce9826cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable domains, suggesting it functions as a link farm to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=ecology+practice+questions+answers PDF link annotation
    • http://angelescare.com/userfiles/file/towakenosi.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/81616322511.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3f53edc2f---21200472538.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/b10558f971cd65c8fc3273bfa504a0f2/91527402121.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7c344690d---javitifadub.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6e4e14a07---25126681528.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a2286d10bd0---42144493938.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/1jhnps5h5ckb4sub17a4evafd2/77972594026.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/r2sohi0mepqdc5jb2927d7s8v0/41798653266.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/24817050994.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/sukotaripuludaneled.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/nobomebutijepuzumu.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160824c6ccfb46---87061933482.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0df1a391d---rerenifelupebexozokub.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3c8361b55---32437436947.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/17014893762.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/52d1c5da9635e8025ab7febb14c9a405/xozesubuwapidotofiz.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3a7de4a40---61821177231.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c24853311ce---68954308198.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/a5f8b3cdf91e3989c9162171cb0741bc/gubopubobapozapajujaxeri.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_off00013699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13699 10976 bytes
SHA-256: 3ce35508ba3d7d079df4e9c45861eae8e7d2c447a3e14d5bdd95461f4a9b9dfa
font_01_sfnt_off00015004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15004 17448 bytes
SHA-256: 88c54038934347cd6e92a9789c63b918e025c4dcef94d1864fdc3c22215d67c1
font_02_sfnt_off00017dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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