Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a93a52b4b33c244…

MALICIOUS

PDF

82.0 KB Created: 2021-10-07 05:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6c1e6c6b2d0f7bceb3dfd0d7cabfa0a8 SHA-1: bacefbaf63d84c1bc1f3dae296e8c0b73b2d83cc SHA-256: 5a93a52b4b33c244ff4b585505e69afcd61313639061697927d8a1675e8ae206
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 functions as a link farm, with numerous URLs pointing to various domains, some of which are associated with compromised WordPress installations. The presence of 'utm_term' parameters suggests an attempt to track user engagement, common in phishing or spam campaigns. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://medvor.ru/uplcv?utm_term=cod+and+lentils PDF link annotation
    • https://morethancars.eu/uploads/edytor/file/zitinu.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/zavule.pdfIn PDF document text
    • http://airmon.hu/images/files/89424015094.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/44822087814.pdfIn PDF document text
    • http://xn--80aer5aza.xn--7-4tbj3b.xn--p1ai/ckfinder/userfiles/files/88204349422.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137398a599cb---78492308857.pdfIn PDF document text
    • https://paperland.bg/uploads/file/71836400097.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615392124fb33---89395074959.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/xeguloberuzoran.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/69637563918.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/ripuvokala.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210913162107.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/tezozipufajimog.pdfIn PDF document text
    • http://bluetact.com/ckfinder/userfiles/files/94716731255.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/rojasonezikedodude.pdfIn PDF document text
    • http://agama-rc.com/upload/files/77902215040.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153a49268dbc---juzuxerebixiniwovipub.pdfIn PDF document text
    • http://stroi-sistema.ru/img/jukidotinas.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f24938af40---tamigu.pdfIn PDF document text
    • http://baoveantam.info/upload/files/bikutatawuzalojogos.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/52561958614.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/medaf.pdfIn PDF document text
    • http://blccy.com/userfiles/files/39317585511.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/xijebepovowodikakakup.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152a99adea1e---67492358767.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/lurivoxasix.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_off0000dc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B0 18424 bytes
SHA-256: 4b84101c21a8ee03f8c660020353579dec0acc3f6dc75a30c7acc47b0c31d600
font_02_sfnt_off000123ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BA 10172 bytes
SHA-256: a8a04f3f1084e17922720c02c319d722481c6eee0dc73cc7602256a54f5e8791

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