Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0ee77d91e5f707b…

MALICIOUS

PDF

75.9 KB Created: 2021-09-01 00:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2e3b63c53dbd69258ef06c5b473b93c4 SHA-1: e2ee6e0ca48b999740eb76f6aed50f95827a7b90 SHA-256: a0ee77d91e5f707bdacf613cfb1ac766e2b374fcb6ff9655f1ee1030a598cd28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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=thin+lenses+lab+report+conclusion PDF link annotation
    • http://theheavent.com/userfiles/files/91900709231.pdfIn PDF document text
    • http://xinyuemu.net/assets/202108/files/20210805110111876640.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/25265181481.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/e01b6b2c18a9de96b83d7fea2a054bbd/3002186044.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/28693653781.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609d03f386947---44508213839.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/51321809451.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/67352967086.pdfIn PDF document text
    • http://dzbnf.com/upload/file///wubugupatu.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202106250119487468.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/bb93194d4a2453c753433dfe65114158/fuwinofamogagofadezidaf.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/63330890529.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609807ed4281d---jibuzopimawerolef.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/29571932750.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/6351344556.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ed3bdab35dee0cbca9183d386d8f4c51/38447640054.pdfIn PDF document text
    • http://trevorhannant.com/20713266058.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c80a85154795a9d08ebed16307e714bf/34807042042.pdfIn PDF document text
    • http://camptagola.com/clients/66689/File/13899832581.pdfIn PDF document text
    • http://kotolantopeni.cz/file/dozevipupedugam.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/585f4bd41455f7b596a6b0e68eacffd7/98395992215.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/32390561511.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/xukamafodulonojowim.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160761feb36ba7---14997728162.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_off0000c370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC370 17264 bytes
SHA-256: a16d3f7f775330f1c5071269ff43c0aa66b705c9160bff25b6eb604779da0443
font_01_sfnt_off0000f0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D6 10672 bytes
SHA-256: 35fcf7d421e32d65505b75f95d0fbfd2b52830d61908686aa5552673be03bfd4
font_02_sfnt_off00010908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10908 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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