Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d1b74f86135d73f…

MALICIOUS

PDF

81.7 KB Created: 2021-09-19 20:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1d4594ec710b1445996b089cb9d8b604 SHA-1: b61a0cddfedeee38b8db13fe88194e042d0c866e SHA-256: 2d1b74f86135d73f3c140399b87c9b464a4c08bae0a6c17535ed5b1eef9e8568
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of embedded JavaScript suggests it may be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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
  • 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://areicon.com/images/file/golenipake.pdf In PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161474b0b4afa1---vomikoraruvebevukaki.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/dovob.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16145076133321---3529122772.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161458849903cf---nuvuxizedarisa.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/kofemuwumebet.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/73516775603.pdfIn PDF document text
    • http://www.zdravotechnika.com/ckfinder/userfiles/files/tofevuwejorirejidegaziz.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/23173969062.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/90rofd6rpdvophv26fp3dc3g77/dafowepalerumozakukimako.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/70948438653.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/xudupaxevegusikedarunem.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/3059687545.pdfIn PDF document text
    • https://clove7.com/userfiles/file/16662812638.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/d31ec245c222a4dbc47a8ecd67dde643/37469429992.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/157638620613f671fb9076.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/92375980112.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/98721806673.pdfIn PDF document text
    • http://zamgph.com/uploads/file/092227337439.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091008553989628.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/jolatodetunivufesomev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=qr+code+beyblade+burst+turbo+valtryek+v5PDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28B 19868 bytes
SHA-256: 93c05d2e9a44d5aa9b9cc59f033d7311342e8ef99b1b3f40e1cdb92c4ad1c62a
font_01_sfnt_off00010767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10767 10872 bytes
SHA-256: fb167244b0952ca723358877f793d399e38cd97c2dec90402ddf47200e35aaaa
font_02_sfnt_off000120e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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