Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bb492d0d18c9a47…

MALICIOUS

PDF

77.8 KB Created: 2021-09-07 19:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3cacc650b4d9893be148d197860a7ae4 SHA-1: 75fa701e5506fc148adeb9234a4906f840cdc258 SHA-256: 0bb492d0d18c9a4735f2eff0d511ed829c394545ab0dca89c0a04626e3a7b7fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://laborke.ru/uplcv?utm_term=the+whole+of+the+moon+piano+pdf PDF link annotation
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/b66959457620f23d93ead0f9b478af61/52168175189.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/16rkmjlh6ik2ngkg14v0ljp91s/86800347855.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/pemuwoxo.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/nedidiro.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d60cea5ccb1---66376873147.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/gemirisudarotuloko.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/a4c760b16b29c861d42a73743aab4553/waban.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/u8ni764a3li1gpnd5tpgesca9t/kikelurejakupokemuf.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/43d9b7eeda6f56b1dedddf90305cb13d/xelosetozimag.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/bowitegote.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102fb5a86c59---31041191987.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/3c3f7534a96c8c3142c9ebe0a2ae3576/novixajululiju.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/32953083197.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b79723d3d73---62708716359.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/92875131450.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/54266838874.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-1/20210501200920397720.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/nabudavutakalakapol.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/3820136b30bf2f5bf661972694bafcd9/66334989305.pdfIn PDF document text
    • https://isosklo.cz/uploads/31910338412.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/94335936726.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/43295373048.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_off0000cb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE388 18016 bytes
SHA-256: 60d11a54668c02b89706d24cc31ae16c8cb1a4a26cf4055e7ffdf4fd9f6ce038
font_02_sfnt_off00011227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11227 10544 bytes
SHA-256: a1e0e256a337af4d4dd360817035725cce1a76eccb559fdeb3d171dd4e5fb9e6

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