Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f0aff8a78911afb…

MALICIOUS

PDF

85.0 KB Created: 2021-08-23 22:41:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9de0ec919299230b9f02cbfc6195eb1d SHA-1: c804c611f901532855166b3b369865ad49914bb9 SHA-256: 5f0aff8a78911afbcb74d2c57a512ef4eeff3f164c62a077d74c7d29d7d037bc
164 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 upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or malware distribution vehicle.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://zionapostolicministries.org/uploads/file/59674312575.pdf In PDF document text
    • http://chinhsuasolieu.com/media/files/39464074115.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2j62f5b1cr1kaimkd4u8jji5m2/4570796607.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16071978d2a6bc---49103021740.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4294e5e37---tepenenupigerib.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/salide.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/44944003824.pdfIn PDF document text
    • https://brs.jo/userfiles/files/lofanexebotibazuno.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/24429361687.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/89992140827.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/85683546311.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/94996106505.pdfIn PDF document text
    • http://weingut-suppan.at/files/fazetosomuxolifojabowe.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161142ca208975---48994828334.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/xinavo.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/15961267586.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/wonulu.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/ip0u57m1io6ftq5adej4pc9c88/38063517829.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c947f5ca9af---mageg.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///56199116916.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/16486083425.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c899fa018e9---gupefujofax.pdfIn PDF document text
    • http://www.centralperdana.com/file/37114679628.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f7ae3f731---sotesavozunadekefawego.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/30044325585.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/c08fb5053148662de810cfb311d6dd8b/10238412466.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbdc39482c---73384132410.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c465b0609---faxateviliritegax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=madea%27s+witness+protection+onlinePDF 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_off0000e883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE883 10620 bytes
SHA-256: b7dc1b945dbddc829f09fd61843dd46814917d3adcbb59397d7060a26428e73b
font_01_sfnt_off000100f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F4 16944 bytes
SHA-256: 2dfe259ebf4fcfff7486355549642ea1252c66a6f4f259b14a9b686005d27b06
font_02_sfnt_off00012d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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