Malicious PDF — malware analysis report

Static analysis result for SHA-256 34a7731641ab2439…

MALICIOUS

PDF

83.6 KB Created: 2021-09-07 23:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 65f9baf039abc9189697a7b60e1c8485 SHA-1: 9c4648332dbbfeb4f535ef32a1763d209d0a4e94 SHA-256: 34a7731641ab24399434fde5f37247a07e739c96598949db309024b4ca12978d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, directing users to multiple compromised or suspicious websites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users by redirecting them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://clubslotalmatriche.com/calcas/file/bixivufimimi.pdf In PDF document text
    • http://agcslohian.com/userfiles/file/somoxomepikesadovowega.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/3583if8j3049u1f7o7hce4j5tf/zujid.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/70251403730.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc03bf4e0ab---kunezavisoxipulopuma.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/jevoxivep.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/82451084964.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd5dbb56bc---80803819372.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/360cf5002addd014b51eea896f097ca1/rilirodinide.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/4fff0ae92868ecafc8baa30b04e1e785/81363741442.pdfIn PDF document text
    • http://overtonnation.com/clients/f/f9/f97855507a39dfa58978186db9bff07a/File/kofuv.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/93060260676.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b93c93f4be---64579509498.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/838360c2048ac6dad7a678bcd06cb65b/87195157150.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/334f9e9db6351ac8e6a1fba19e250e12/totagejenawodejoso.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/16b8382411b49906a7b9569c1725dc11/menoxixik.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/zelazuganepuxozoma.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f6fe098bc8c---22386779985.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/076f02d964daafc886c592fad9dfb739/porodosenogowexoweba.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/8bb87634a3fab1b8b2a7d307fac62652/zuwujufakufonozovarugepan.pdfIn PDF document text
    • http://cochu.net/resimler/files/fabofimezitamuvagefipap.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/dixonazasudexuxitubup.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/larimumi.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608847fe2817a---wavuxasiki.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdee5c8c44---56903166185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=dewalt+dw+50+planer+thicknesser+manualPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/1ea6ac75f28f82a094f67b7c85661744/10122721397.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_off0000e065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE065 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87C 11192 bytes
SHA-256: bfd68fe8c42e9a9fdebb2aa0d8885c5edd90e3af66393d46e1fcef367a3f7afd
font_02_sfnt_off00011292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11292 17712 bytes
SHA-256: 40fb453573cee360b5b213397acc766bb77d1c9ebe910342b9ff70d71acb6430