Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c7033e2cde0282…

MALICIOUS

PDF

86.9 KB Created: 2021-07-02 05:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c6660cf3bea2844e1fabcbf7847f5c9c SHA-1: 86e5c55790242d7d2374223587c45d0c9c0e2d6b SHA-256: f8c7033e2cde028209bc45bfd949ccd83b964e4b304b29395dc7f588c48374cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains numerous links pointing to compromised WordPress sites, suggesting it is part of a link farm used to distribute malicious content or conduct phishing attacks. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF acts as a lure to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://wastran.ru/uplcv?utm_term=daily+work+meaning PDF link annotation
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0107b5f2f3---fizolerureg.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/3mbde8ut79asc3maotli1mg4m0/59136356927.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/520ec009a71f80da798d8f845a8c63bb/pavifatuseke.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acf5a6ccc5---ziteguritipu.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073714c35cbc---23184685553.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088abe8b1dbc---63057673167.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/nubidugupojutasumuj.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/sagalis.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/92778328525.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/ipcgbot1nspumk2eq3psov3ku5/90038516116.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/3toumnnergskqkbe8q1c3d02lu/5017332331.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6054c57e5---88194012862.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099b13eb5c2a---fodisebezawolikebolesesiw.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/e93jp7ack9od48i1mkej2u6cq2/10032192943.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/46725991978.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/gimis.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942b133f459---moximesimijetini.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3d25f39303---dewupeliro.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/66682515154.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/92621026308.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/21092140246.pdfIn PDF document text
    • http://dzbnf.com/upload/file///jutowodaxir.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/gotefisogiwake.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_off0000f520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF520 16312 bytes
SHA-256: c533e992b084d1b4dee84fe64bb8c72cf1a1062fba963dfe3cfe3a76d4743190
font_01_sfnt_off00011ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC2 10476 bytes
SHA-256: f855a5e6b74d5c07d9aa2b76ce1d0c13da338d99146848157bb0b2eb80509f1c
font_02_sfnt_off0001368c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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