Malicious PDF — malware analysis report

Static analysis result for SHA-256 6621c9aff2c6bef6…

MALICIOUS

PDF

84.1 KB Created: 2021-09-09 13:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a279d78165889fc736a3f308c8e4022d SHA-1: ead18bd0a5b6b76ff7aa790a208a445d78046499 SHA-256: 6621c9aff2c6bef6bcf61a60c23c255684701232e8a5e93dd3e5d8f7adc28696
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised CMS uploads. The primary purpose appears to be directing users to download potentially harmful files from these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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 http://quesnelfoundation.ca/userfiles/file/1575512435.pdf In PDF document text
    • https://muacash.com/webroot/img/files/9650501247.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/meravefodukejukaja.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/kuvivakofobupi.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/33044408807.pdfIn PDF document text
    • https://fishuntpesca.it/file/kowopidaxudixebo.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135ba52778c4---keben.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/bixejeve.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/pamotawitifakeramujak.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/kodik.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/41273387070.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/31aa493f5b87caf9cb651893ed57d7cb/lemubelojomuriralifi.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///tuzanomefurixel.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/93665560753.pdfIn PDF document text
    • https://msvadba.ru/files/file/pawabo.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/misuwusi.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/vurizuvakefetewagetut.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/15353386080.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/numodufulo.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/iro6evrmcuarfaq2ug55n58hm6/67539200649.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/tesitarugumite.pdfIn PDF document text
    • https://defi128.com/userfiles/files/rudelezobizadipu.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/20729203752.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=gba+rom+for+android+free+downloadPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D4 20708 bytes
SHA-256: 201e2bcfcd838724a51d8fd2b8ed7f6899f576344938ddce91ea033ae3ab3955
font_01_sfnt_off00010a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7D 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off0001127a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127A 10512 bytes
SHA-256: 1d751f2d47ede3f6008b0c60f87ae3bad65b7bee247ff4747621113d3f71f933
font_03_sfnt_off00012a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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