Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd072d1709b51a6…

MALICIOUS

PDF

109.6 KB Created: 2021-07-24 00:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28cbb65cc918dda0c169149c7a07fb43 SHA-1: ab584747184a76196b10bede75793726dd32e134 SHA-256: 8bd072d1709b51a6c64e51a6a2bdbf0bf1c0cc616570904b11eff49df4a00a12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites, likely to host further malicious content or phishing pages. The presence of numerous external URIs and link farm heuristics strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/5675c230b5137ffd69ec6310f82210ba/37066427961.pdf
    • http://www.bandungmesin.com/file/38127093844.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/60740428048.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/582e3c884cf11b9d0784f9241a882952/zonazanomefelusomuval.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/sikokokefuxusoze.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/hsqccj4at7o1pjalcdo51l6ek3/67654316987.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df9e5b0b61e---13777062933.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7u629gcnrfkb328qd6bbsri0c3/6195677532.pdf
    • http://55thocscompany.com/clients/62662/File/xurobosenivakubivuket.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160afce56c669a---95245147511.pdf
    • http://enotecagaribaldi.it/userfiles/files/89480999527.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/466uhk60cllsuan6mftio4lp50/dizisipedok.pdf
    • http://scholl2021.com/clients/1/19/19bca4f76d5065ca3bffbfc1c67e7925/File/36605691189.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d12f43613---vimugetazilujapiku.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072555ee2515---10222768156.pdf
    • http://ty-universe.com/image/files/20210723_200001.pdf
    • https://bustotoronto.com/userfiles/file/64397107171.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f83b2d9ef6---14965694325.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/19e40bfa7f30edaf8efe384f42a0591b/joladojagawuvokerugotiruj.pdf
    • https://gbagencement.fr/uploads/file/63390270375.pdf
    • http://triple-a.co.th/ckfinder/userfiles/files/40543777840.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079761054907---79267152614.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+write+a+letter+for+spelling+mistake
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014731.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14731 16792 bytes
font_01_sfnt_off00015f43.bin
364476a43003430ef8756ee2994b6f448db3b815dc568cc611d6ea2099755027
pdf-font-stream PDF embedded font (sfnt) at offset 0x15F43 17856 bytes
font_02_sfnt_off00018e23.bin
1675f57f792921e16b209396f9a06070cf132bd22d29ab3d827079130acccf40
pdf-font-stream PDF embedded font (sfnt) at offset 0x18E23 10872 bytes