Malicious PDF — malware analysis report

Static analysis result for SHA-256 326e05fc0343df92…

MALICIOUS

PDF

82.9 KB Created: 2021-08-15 05:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fa766a7dde45722956fef34c6d2c431a SHA-1: a6bcc37cdcd1d8e0aae8893aa755480f87dfa1f5 SHA-256: 326e05fc0343df928b2014f17c4d1ac1fbcacb6ca0db35bcb2e7a32864c32e5c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document instructs users to install or connect with remote-support tools, such as TeamViewer, which is a common lure for phishing and malware delivery. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://krisoc.ru/uplcv?utm_term=teamviewer+12+free+download+for+macbook+air PDF link annotation
    • https://teddybestore.it/file/77978083995.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/25596930824.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/rf88gclkdplagt09rpe7vkpgp0/15892623406.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/kf5rah2sato0f1vim1qhbdjh6m/51932350875.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/rowarepixuzokonawemeti.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/jaguluwukakexapezavofi.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/zoxuka.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/9329433223.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/79641199877.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/66643052359.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/83909601712.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16088cefc83f53---lesekawifotug.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/7iou5vuag1e0cvdgbd84kdr2u7/fekituzubogezexuwubo.pdfIn PDF document text
    • https://abeess.com/userfiles/file/xofubosejimirosagoder.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/23047795972.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160708d5de7546---lekuxitoserotex.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210725_C40CF216D5056A8D.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/84902097758.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/1915f37a60c3fafa3f31304c078ad18d/ripigolarida.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160adb1e9a0cf3---3961577514.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/1c5287b305150a3699337271e1830518/defigiwarilutogex.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/26586877901.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/dotetozapadopatoga.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/10c792d73b3c06f7d94b36a495799766/mitikawinewovipigas.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_off0000e1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B6 10892 bytes
SHA-256: ab204bf0f907ba0b9a238023118b1ded2b6dcf0eef1c9d2e729ec1d42eaa2cb6
font_01_sfnt_off0000faef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEF 16256 bytes
SHA-256: bf545bc527cfe2adc783b66ec7fb8377fdbcbf5e33c2feee6efb2435fd27f89a
font_02_sfnt_off000124f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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