Malicious PDF — malware analysis report

Static analysis result for SHA-256 64e096926cfca716…

MALICIOUS

PDF

78.8 KB Created: 2021-09-06 20:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 636dd8d06061ceaa75c99fa4f9ad0c6a SHA-1: e6d1eb455d7fefa0f8df64375f1f1de6d4dd0233 SHA-256: 64e096926cfca716d1b24418c29ed1cf7156c991ed8400efe0311d514134a2de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malware or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb79c6df2d---45034634004.pdf In PDF document text
    • https://mavachhaiphong.com/upload/files/99633277876.pdfIn PDF document text
    • http://rentaruedas.com/files/others/julujadiparuxe.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/mokutope.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/goripedabev.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d16b97b0a---61057652592.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/fuvezenofolupis.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/325r26k36v4j8qde3m7us466k4/lutozonose.pdfIn PDF document text
    • http://myredm.ru/uploads/file/3713442731.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/355676a589e6209571080c1bc7108a4c/23421442366.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/tokuvejalunosofawizoxov.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3ea29443064bb46b2da02405f77eef99/73472420718.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/fawesamox.pdfIn PDF document text
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/49449707519.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c51a135d97a---mivegidebaxiwupu.pdfIn PDF document text
    • http://storemisr.com/uploads/files/guxozuriwusukafiv.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/10814762765.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/80259512472.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/65829180618.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210901040121.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e0301e391d4---dumepale.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/wixibe.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/parowinugebivirikepar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=calendario+trimestrale+2018+pdfPDF 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_off0000cf69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF69 17120 bytes
SHA-256: 0574228f20bbcce71a1035e9c5e36e2736e3d0b055e644e3e985720c490f4685
font_01_sfnt_off0000fb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001134d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134D 11192 bytes
SHA-256: e3ffa88f7f7f37bf06511f7600e499a958b6742b6ab411a4e1c43c034f6c869a

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