Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7a6e76a34afd50…

MALICIOUS

PDF

82.3 KB Created: 2021-09-09 13:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 28efe519ee7babe2321378fee46d30b2 SHA-1: 7f4ab9e0f355c796816ab35064f7005dfd1df485 SHA-256: 8f7a6e76a34afd50d3c71b006679a47f53fed23b60e7ba91b5a81fa2bfcef942
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised WordPress installations, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the presence of multiple PDF-specific heuristics related to URI and link farms points to a social engineering attack.

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://chcial.ru/uplcv?utm_term=how+to+connect+xiaomi+tv+to+phone PDF link annotation
    • http://acsalma.hu/userfiles/files/13668320381.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3e696db22---86616488545.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/tezel.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/bulokexu.pdfIn PDF document text
    • http://15881588.com/ckupload/files/57849452782.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/biwivisifoniputedam.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210901172444.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161394446c31a9---26690264806.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/tadipelexivuvilanofeg.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210904_2E8B3E5CC27DADC4.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021981756338040.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/sezisa.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/96044780658.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/dubajogutowijuxomo.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95347887239.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/sifijunupezisorojoberevi.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/90762261752.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/d4336ef61681c25652c406c161f217bb/wigarikajova.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/7b167a297f54e96b5fc682f2e21b0ced/naxus.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/sepod.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a8e8972b1---befixerisiw.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/pitorewid.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_off0000dde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE4 10572 bytes
SHA-256: b9c5fd2b9ab305e8d0f69ca7dc692f0f06b4a5379e22efd9ab07d28fe701e969
font_01_sfnt_off0000f5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE7 17808 bytes
SHA-256: 77724d4d4b3ea07e76e0327a48f13417398c739f17448daaae0c11477ae6f415

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