Malicious PDF — malware analysis report

Static analysis result for SHA-256 c657d5e6dfa93e13…

MALICIOUS

PDF

83.9 KB Created: 2021-09-02 23:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 65c42680a6683704d7293c17c05fb41a SHA-1: 3abcbf3e3b099ec0ea547e0b4e78f39f493067fa SHA-256: c657d5e6dfa93e13004c379abb05b6b561feb3dc695b163425053c874854e108
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to external sites, some of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pixomot.ru/uplcv?utm_term=kitchen+utensils+worksheet+for+kindergarten PDF link annotation
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/patete.pdfIn PDF document text
    • http://htwy.com/upload/file/86125219148.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/68190663377.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/vokasebijesurawusorivu.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/j1vm85u6dmbclsqgoil1p3itq3/todudeju.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/fazid.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/3iq54b25n1vkvr3a9rt5tm7qb1/18717832599.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/buxurinofu.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ff6f3f1cf2c---wijezo.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/duxiki.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607098ef3ffd9---72013255651.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/vevawibodosamavomoluzan.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f2fa38d5ba6---85761659821.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/e84f5e5671f6ea9d7ff4541facccdf9d/kevasuwadumexipexefixav.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/lunewej.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/datovoxu.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/dumulekexupixexetesuk.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160895db5e0e4d---74042503398.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/xodivulufemazi.pdfIn PDF document text
    • http://identik.hu/editor_up/xokiforafudonulug.pdfIn PDF document text
    • http://pentas.eu/userfiles/file/67306813802.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/28588948814.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed19a5dee6---93960667667.pdfIn PDF document text
    • https://triosms.com/userfiles/file/18911206796.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_off0000dea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B7 18380 bytes
SHA-256: 4682eb7f4363508da3947e48ceb2ba96a127f6d0b4d41fd9970073349d38e483
font_02_sfnt_off000126b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B1 11024 bytes
SHA-256: d0aaac18459c3b2c485c89e8477dc24fc2bf5fe21e50087bbaf30f95876abaca

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