Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c8258f22c7db95c…

MALICIOUS

PDF

84.5 KB Created: 2021-07-09 07:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 18c6333cc92897cf1220dfbcbe44baad SHA-1: 4128b9f075070be39e62d3deaebe9caeb3eefaaa SHA-256: 2c8258f22c7db95c0b495a04962936a3be15378c23660a8602777015d3e2d775
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, which identified it as a phishing trojan. The file contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to phishing or malware distribution sites. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://queure.ru/uplcv?utm_term=akita+poodle+mix+puppies+for+sale PDF link annotation
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c77c0e7a2---54240699652.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/39260606709.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/ee1a2cebbd031f2e0abd367331ac31b9/61522504045.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccfd714038e---nozugoja.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afde307e846---20118811490.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/cdbc22a48d60790064aff2947abe1c7e/kanovupolaxuzerixuli.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/73307506545.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/vawekafe.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/26847be5b8ee00e429ac1e919f8efc1c/reganudasemuge.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/90365724697.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/8bd712f79afeabba17ec397e5843fc4a/kameke.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210522000012833174518.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a400eb65b92---wawaboxejabelajorumenem.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/47818980372.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/9ee823b96b093df5770cb9384397622f/moxezasi.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/32518976406.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/16021461970.pdfIn PDF document text
    • http://sport-way.ru/img/file/zixupejizuguzovufebipajig.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608427b8c5401---wetupamuraral.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/2c70aee78061894131a5e57744af5655/wokenutaboxut.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2775f14b0---74720018984.pdfIn PDF document text
    • https://agatanorek.com/files/file/titufobepipofuzabosafa.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/supokerigikilulujavakum.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE565 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD77 17476 bytes
SHA-256: 2497b80e64bfe33609d41599895b951ef583b3573b6ee8225f9b5f1bfb985094
font_02_sfnt_off00012bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAC 10832 bytes
SHA-256: cf1b82c4557127dfd344824224e71bc106911d73cfb9cab081168580f4dde825

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