Malicious PDF — malware analysis report

Static analysis result for SHA-256 51092a5469d22952…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 05:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 96bfd9f28e113e2542e4634695f307a7 SHA-1: d72de5200dd303b699ab19f5a004b3ce05da1193 SHA-256: 51092a5469d2295252ac34497abec7d193c84e84e3de2523faa253329bb522a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It contains numerous external URIs and is identified as a link farm, with many links pointing to compromised CMS upload storage or disposable hosting. The primary function appears to be directing users to potentially malicious external websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://medvor.ru/uplcv?utm_term=top+gun+latest+movie PDF link annotation
    • http://finadev-groupe.com/userfiles/file/dupoxesuvababupetaduloko.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/66647620324.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/161438526726e3---29788818499.pdfIn PDF document text
    • http://ihdbd.org/upload/files/logigujipezokakedunokuxe.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/8520812333.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/92427558437.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/vafaremarojikuvabajekul.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/mirenerivebizopub.pdfIn PDF document text
    • http://tercovci.cz/files/file/rureke.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/nomadomiw.pdfIn PDF document text
    • https://asi-filter.pl/files/file/tebuk.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/54540577864.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/31490629895.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613c12f30e090---bezupabaxunulimuludutep.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c1db8b595---faraxorugemudedigefajatal.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/movit.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/b73u61140s551dthop3kjdvkd0/73006798626.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/51097176013.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/7711871241.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/kakupibaboselo.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/48e0b5af05b220d9585ebb9047915fad/28209239457.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/08bdf9bd73e99c6acbd7a678a2a9458b/pikotu.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_off0000d7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCB 17940 bytes
SHA-256: d57c349dd24b52192339c8fa4ef01beb357fc5ff6e3b9e323b4ef3d8ee24b184
font_02_sfnt_off00011e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4B 10624 bytes
SHA-256: cdf466d4bac61701d16832737f05b352f4b2e242dfc6363612e7eff6a65e5069