Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a0ff73bda0d7390…

MALICIOUS

PDF

87.7 KB Created: 2021-09-01 06:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 75e93b45e0069e52c8251d9e7b4b1a37 SHA-1: 72d6fb2372ca7dab584199fd5fff8828d59785fa SHA-256: 2a0ff73bda0d73902685eecfe7ea9f3dd7b3330baef3e296fd8fd661b94da308
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and disposable hosting, likely intended to redirect users to malicious sites. The presence of external URIs and the overall structure suggest an attempt to lure users into clicking links for potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://chcial.ru/uplcv?utm_term=how+to+make+the+chat+interesting PDF link annotation
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb103a1dc1---nidadidomutojetufi.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/mupeluloferejeta.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/de045de47288c6abe0949f6a0df00eed/wuzubuvepibabenoveletis.pdfIn PDF document text
    • https://kawanmto.net/contents//files/54724342213.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/fc073bdceb2d4d11754c5e202c073fbe/58419345555.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/vedetejejixelatevibe.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c586f341a---15251951982.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/fedafebowofu.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/67542865698.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610f9b853c220---gexevemomagagulafedur.pdfIn PDF document text
    • http://mamitobe.ru/files/file/bokunimofotewi.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e406a7af4a---makukevemezakaxujawaxuzi.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/xamowitegobiludebupo.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb1cd1a5a0---65688033251.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/gijarurokolupotata.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/rs23jr46f27p0uph8mra548b1b/3997472034.pdfIn PDF document text
    • http://landmanenterprises.com/clients/6/66/660ad4be7ac834282af30b44844c6003/File/40598780918.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7abcec0f6f---92842254195.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/23401542912.pdfIn PDF document text
    • https://giustofiori.it/file/kinaluponudalodefofalubu.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/xilalifeluvatejar.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/13040850356.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_off0000f38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38D 17212 bytes
SHA-256: 5d9d01650c351986b562760a73a538dc06f16e0aaac32c9938120b651ec49130
font_01_sfnt_off00012049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12049 10800 bytes
SHA-256: 7ef3d31039eba77e591ba02d481a5cebfecc5cd957d5fa24bc17c7b893fa1810
font_02_sfnt_off0001390b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1390B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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