Malicious PDF — malware analysis report

Static analysis result for SHA-256 7edc601592f16bf1…

MALICIOUS

PDF

80.0 KB Created: 2021-09-21 16:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 12ad12e0225bf6c978c86688e3d445b4 SHA-1: 1bf69f4065c4920f635e12501d63054180ec3dba SHA-256: 7edc601592f16bf1b89f2f90ad2a0581f0e233cfacdbd7dca5adb90303b4c87f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, many of which are hosted on compromised CMS platforms or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are used for SEO manipulation or to distribute further malicious content. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://drafthe.ru/uplcv?utm_term=android+file+transfer+to+pc PDF link annotation
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/161395c079cd7c---97976135234.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/1312613149.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/c3372eaff65fb6d5ca4e94217ea56171/jadixa.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/mipalobesum.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/modupozepuxizamejuwusuv.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/daxegemuk.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/pawofuvivopopozoduzofeta.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e106812e2---36012696938.pdfIn PDF document text
    • http://praguetransfer.com/files/file/34627513297.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/0b53a02476be535c9e1b06a3b02e4388/fesapakifogodoxufukov.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109091207324587.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/sofifiwigukixobib.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/41999762629.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/gavupetukakivigojar.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/39f34d74d9ca609b5d8cac8379ccf046/woxadum.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/50664275643.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021091312274522.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/78909262625.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109191155568021.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/jedomitag.pdfIn PDF document text
    • https://toocapen.com/files/vedeguvamutokipamixepo.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/71965197080.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/suwufixozi.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/butujilegokepu.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/fapil.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_off0000d412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD412 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC24 17664 bytes
SHA-256: c7a9d08e1d6289e89df98428c4ad43addb3b9dd4ffcf382f837607509ff453a8
font_02_sfnt_off00011a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A04 10596 bytes
SHA-256: 7c7af1096682b651512dc65e35d9877a219facbc6ee32dfdacb781a53f8a6a96

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