Malicious PDF — malware analysis report

Static analysis result for SHA-256 daf2c69f2bf82aee…

MALICIOUS

PDF

90.7 KB Created: 2021-09-06 23:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1be33926554c857a43f175638ed922c6 SHA-1: 826c4da9ce4f820530017b3620c21f3007bbb026 SHA-256: daf2c69f2bf82aee58e78fa98728a98dfb2104b3af3c85afd4c231f262ca4731
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple URLs pointing to potentially compromised WordPress sites, indicating an attempt to host malicious content. The heuristic 'SE_CALLBACK_LURE' strongly suggests a callback phishing or tech-support scam, where the user is prompted to call a number. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa5d5c371f---4867280447.pdf In PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094166534e98---temurixobamedob.pdfIn PDF document text
    • https://datajournonepal.org/files/2082762627.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/68879167889.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/bafulonezaboza.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/medexajoluwotoju.pdfIn PDF document text
    • http://kccmaul.com/files/files/tekumesijekezipo.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/bomavusafaj.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/rtbouctqjlqviqsoamrjpgasi2/zuzorixalijukuwapewox.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/fonarow.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608483fcd5a1a---dafitadafuje.pdfIn PDF document text
    • http://thaide.org/userfiles/file/56732904830.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/b2c7ac43905282462566cac04e22c2df/28513450890.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612b9feb7f099---pivuvuberatavamega.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/3f0k9jvdvj93h7op3t9kkgsqvt/69705599265.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a70fc866472---guraverugevoloji.pdfIn PDF document text
    • https://halkapsikoloji.net/userfiles/file/zonetetujejif.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/81666935256.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/xilobegapu.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8c8171082---balomelutufidokinexunubi.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/3da8a88599a47e00cea1b4e80a988381/8758472925.pdfIn PDF document text
    • http://evola.it/userfiles/files/68731142352.pdfIn PDF document text
    • http://shardamedicalstore.com/singhania/downloads/file/muxemovodijutufop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=castration+du+lapin+pdfPDF 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_off0000fff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF5 10488 bytes
SHA-256: 2150d9d15756a214ee580f630ef04334529bfa82e831abe5affd9cc581943fe8
font_01_sfnt_off000117df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DF 17668 bytes
SHA-256: a7eb3dacf6ebf16f4a4019a13a84972a9be8f5dfaafa1ef513e3f3379c08b8bc
font_02_sfnt_off00014592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14592 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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