Malicious PDF — malware analysis report

Static analysis result for SHA-256 606fc91f322077e6…

MALICIOUS

PDF

95.7 KB Created: 2021-08-08 01:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 56b7bc73b763ef03c854b4307ad6caad SHA-1: 5dc4f6c9df137bae75357fbefac9c0f6231ec5a0 SHA-256: 606fc91f322077e6a9c5e406de7fddd0e842eeca000cf6b0fd3bf8baace18d05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting it functions as a link farm designed to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it is used for phishing or malware distribution.

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 http://security-m.jp/tool/images/file/jagaxutaz.pdf In PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/6676aec567b8fca4f7bec88cfff080d6/57959619838.pdfIn PDF document text
    • http://www.moyekolodin.com/files/25134685634.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbfcc0511e7---46430911522.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f10c58328c---74364224680.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/61856184198.pdfIn PDF document text
    • http://policylic.com/uploads/files/sixefitagupewo.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/12k6em17cescjfbtna8ki10ne4/tufigijogopiruwimadu.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/zupaf.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/3e734d923749d6dcb49d6d9cf68decaa/99646032280.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/d423537e323aec645813d0b76a524914/fagerafarunuro.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/dozopokov.pdfIn PDF document text
    • http://goref.ru/files/file/440619561.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608044ba4582e---fumiken.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/duxamuvulerikematokako.pdfIn PDF document text
    • http://wamer.org/userfiles/file/zaxomawuzab.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/bujamogowijawizomifix.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/gugupoloxo.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6405278078---67975893071.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2f45c318a---78329332931.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/40424404472.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16105ae8cbc609---57580593837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=atlas+de+sedimento+urinario+slidesharePDF 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_off00010f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F01 19868 bytes
SHA-256: 4a1461b77790bbb07a06270b81fbb6e1f3dd871ce5904081207f2a276723666f
font_01_sfnt_off0001419c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1419C 10596 bytes
SHA-256: 4e0c4a551d0a9976be8f09e186681c85b3131cb5ac727d79f48bdc5452ce6678
font_02_sfnt_off00015993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15993 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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