Malicious PDF — malware analysis report

Static analysis result for SHA-256 5427f3e527b20204…

MALICIOUS

PDF

380.4 KB Created: 2021-08-20 23:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: ed143e1c5c8bb247bfd80f21f912e179 SHA-1: 520e94a999a5b2563b06c59668bc5f91a883d699 SHA-256: 5427f3e527b20204bd8dab5281624265f80f67306283cb95a69a5d65cfce7bde
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users to malicious sites. Several URLs were extracted, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8390

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
  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://langestrand.se/anvandarbilder/204/files/74502358308.pdf In PDF document text
    • https://novsport.com/content/File/47313917432.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2f1f102de---51480143444.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/25422881508.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5dda41c629---95379386387.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/63365908839.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/11366465232.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/981d85baf82433179a579f5706f062c0/43457776080.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d19c16d854---tazaxenax.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103229e0eaf6---52678088434.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083e2a496a24---pemilixagevopav.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d8eb8b8ae---22236462427.pdfIn PDF document text
    • http://sergey-yushkov.com/pict/file/jikepegaxunixamanunok.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/71633894922.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d1b90dc03---zizekepujana.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/kivevuwogijevijemegew.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/26601471026.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/02435c6eed27f3cd11248e31a9210ce8/suxebiwujimibos.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/40772412293.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/485aa5c362a2e7c26df1c9401c724998/45193763733.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/kujalobazirobatetaropa.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/xanitokolapuwofetokawaze.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/20062556248.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/70941911120.pdfIn PDF document text
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/mawigagasetinimufosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=pokemon+rejuvenation+v12+relationship+guidePDF 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_off000578bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x578BC 21220 bytes
SHA-256: feaa9cb2587bd1ff0ee57e26f86679cf2df663572e0856ebeaea2a8839b880d9
font_01_sfnt_off0005ae86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AE86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0005c69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C69D 11400 bytes
SHA-256: 444fe1254e208d21f4ce55a7e9e65f59fc2b0b7a570628cf867c8343b0de6d35

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