Malicious PDF — malware analysis report

Static analysis result for SHA-256 969472bceb8069e3…

MALICIOUS

PDF

94.3 KB Created: 2021-08-02 07:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c3869e22dd5923f0913c99628c399bc8 SHA-1: 812f832a9e3aa79bcd751f1386d9d976ac871fa6 SHA-256: 969472bceb8069e371d6dc52d45a106ac5f9273fc083b7049055e6fe3e2f55cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://chcial.ru/uplcv?utm_term=ai+tamil+movie+hd+download+tamilrockers PDF link annotation
    • http://okuninka-biale.pl/userfiles/file/vunawojesador.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/daa26371898a018e526716bcbd412b19/wujepudise.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/pekurimej.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/babinejaxazidedokak.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/83187423092.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/73031647013.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91239133700.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2256a4e0d---pesotezanuziwesikefeniwe.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/7vq929h271cm8vklc5cjdiudg1/12286344256.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8107adc17---vurafefowubu.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/3911316254.pdfIn PDF document text
    • https://spiuruguay.com/ckfinder/userfiles/files/52009511090.pdfIn PDF document text
    • http://glassco.ca/clients/9/99/99aa1728c1dafa3cf8773a75727b87c9/File/wubilawokozumetimimirek.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/75277698743.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/204f96ea118f479490ed33b5c5ce9825/korireluperawavifeb.pdfIn PDF document text
    • https://agermag.ro/mm/file/bifodupazegukerugowa.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/e2e362f884c42e903d0a86441207d621/67506974559.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/f6ee482bac9832c29adc78800a28197e/92670418527.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/dca45dc062e90fe25f011f5ccdd75926/nojibarubivokol.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///pefeduxagalasuwur.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/28708864092.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_off00010beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12402 10860 bytes
SHA-256: 5abd8243d36f9ab590daf5dffcd4e45455eb4d2c5b7dbf3fea8e55a13fe9823e
font_02_sfnt_off00013d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D00 17508 bytes
SHA-256: 59e378630cff1eab95b51f66730d4b73579dded59bc4909da4fc30f677fcf62f

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