Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e0358b68c8cd49…

MALICIOUS

PDF

83.2 KB Created: 2021-09-22 16:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: af49ecb36905f07a93f1eebffec79030 SHA-1: 3607c3c9a4bf81edf6474fe89cc61e879625251e SHA-256: f3e0358b68c8cd4959f290bdcfe46f59018389d507cf0ee1055196fdbe7eb5ab
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malware. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document explicitly instructs the user to copy/paste content into a shell, a common technique for executing downloaded payloads. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=download+film+torrent PDF link annotation
    • https://hizlipin.com/calisma2/files/uploads/xaledapazomatavedu.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/zowobusufakefafow.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/77046536043.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eccf9a1b4b---36258329334.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/85321049404.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/60784254512.pdfIn PDF document text
    • http://huefpdf.org/upload/file/22737647257.pdfIn PDF document text
    • http://integrotech.com/zdjecia/file/wunetipel.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210918_4FC1B0BDEEF3006B.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/29269213355.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/zorutemizipeninu.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/13571142007.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/f26cfb5833079d189493a73ccab154c3/50890669385.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/kudiwekikeligupupovaw.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/25709132635.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/7617121b1c2860ded5339318bee090b2/55912437293.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/41305553474.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/xuzolipurupiwuv.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392231a722c---15850555386.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/22660082951.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/jesutafarekonat.pdfIn PDF document text
    • http://ocung.net/img/files/30113939282.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/2f41id5p2mr6ru4b6ovbc9tg47/47239379196.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090305463073499.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/bewugetupanakujedafuzinob.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_off0000e119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE119 10432 bytes
SHA-256: 233c353c5748c665467e79a9ca6e2bbcaa0bf829cea05ffe870fd6d6a13cc990
font_01_sfnt_off0000f8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B7 18280 bytes
SHA-256: 7e3389a6860987594af01ecb1dbc10374ea6085ca9b61d1040cb1443a6934731
font_02_sfnt_off00012773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12773 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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