Malicious PDF — malware analysis report

Static analysis result for SHA-256 597b4e83506c6777…

MALICIOUS

PDF

88.2 KB Created: 2021-09-20 17:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1ee57814d115925c1375e5ae435ce792 SHA-1: 0fdb0f832606dc11df1273687e06874d33de2556 SHA-256: 597b4e83506c6777d2fbf7230c8e588b1658487cdcf9b8944a3c71237163bebe
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://metnar.pl/web/uploads/files/83371689370.pdf In PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/nizudixofezabiritoso.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/57538367445.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/54114704847.pdfIn PDF document text
    • http://guchen.ru/d/files/lagobudilabana.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/8be1467f4253e4c528dedef3968bd35f/lelabanivelav.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f3a01580f---47485154379.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/gonet.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/xokefowejuwugeru.pdfIn PDF document text
    • https://betsin.org/userfiles/files/51414346966.pdfIn PDF document text
    • http://strahyi.ru/images/file/79976175986.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/zasisaninidagob.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/kotetaxapaxilewolexeg.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/14608588839.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/supupozunabiwosuluranak.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/woxoxaxexowajeke.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/4f027add01e7ac85d382cdbbe647d310/47950661065.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/8739544339.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/75993468489.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/wederikuro.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/sibubepugimanizuzivaromu.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/23962379773.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/83718910071.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/fawutukiwopisetupiluzumi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=last+day+on+earth+androidPDF link annotation
    • 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_off0000edf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF8 10372 bytes
SHA-256: 3763e6d88948dac7fe47fa4f06fa5a04ea3a77e608cd4fdb3b30f8f29cb63064
font_01_sfnt_off00010559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10559 20840 bytes
SHA-256: c8d723a48447e04fe3feae7e20c3e8c5ca2eca6b4274da60b6c38038545a9044
font_02_sfnt_off00013af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1