Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ec5a8e9cd9b187…

MALICIOUS

PDF

86.0 KB Created: 2021-08-03 06:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fadcf7cf7dd9a024d8aa817adbf986c5 SHA-1: b5a23a3a9fa7e617defc24970b2ae002ce520ea5 SHA-256: 76ec5a8e9cd9b1875517bef692e5a4c57aa82230a7fc698985df1376cf8ba508
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress upload directories and disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL distribution suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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 http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160973103b8b8f---gebid.pdf In PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/7098990884.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/32965924926.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f7ac98cb3---12921601896.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/71554539955.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/aec77fec36e9804b366fb9f121d866ba/56065649569.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/t869fmgm2dhu5ebflqbh252bjl/2935862540.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/6aa9a3ecc539a9282f3c7edd06003a31/83803264934.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/b62a0b4f35f7b7c2868ad418f48525ec/78213469681.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b85767e7b7f---12308380886.pdfIn PDF document text
    • http://olympusflights.com/files/files/zulofux.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/xugubon.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/jegebinifarawokogifupabev.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/luzafitigu.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da1aeb97edb---dubogagen.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/a179ad53822e53566e695563c109a7ad/50719322933.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/11813768893.pdfIn PDF document text
    • http://flexa.cz/docs/file/44761732964.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/cb09actj4471sp6kufe09gr4b2/36914548909.pdfIn PDF document text
    • https://uudanbury.life/files/file/16432363484.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/befajid.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210617145656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+calculate+final+salary+pension+lump+sumPDF 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_off0000eda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA4 16544 bytes
SHA-256: e1a8530beb66b521f018246d4a6e523780ea2bf5f46c7e76db5a0342c13210ec
font_01_sfnt_off00011899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11899 10932 bytes
SHA-256: 93b5f4337ba1e65f8e794b8f534a4225fdb3c99fd4f800a8741ecf4efc1ec700
font_02_sfnt_off000131f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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