Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd8d618f9ef7cce…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 03:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 486ee5bf23e61fdb0473c8cb0b43e58c SHA-1: b3b0ac2ee14af0349e7cf7fb708f296ad359ff50 SHA-256: bdd8d618f9ef7cce88c0cd86e28c6c910f32b65e75525c256b5b07e48643168e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of a link farm on multiple disposable domains, including compromised WordPress uploads, further suggests a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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 http://peusch.lu/userfiles/files/pilasevepudarixile.pdf In PDF document text
    • http://decaiyun.com/upload/file/2108140919542854154l3f9au8n0u0.pdfIn PDF document text
    • http://watsonwilliamsreunion.com/clients/82103/File/febino.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/26923417881.pdfIn PDF document text
    • http://langmypham.com/luutru/files/dolifabopibilirakilodulol.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/n4lmhebfq2n1g2j82rstnl2kt4/jaterugigimupokonakivoxe.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/79089792939.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0a8316bb4---rokovazag.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/xiluxinowiwopes.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/gofut.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/16762204342.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/xojemomumulekis.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/al05fhmath9p7i3fg55hcpuqp1/99713006423.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ace125789---10439624843.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe86e2630ed---dagirenilopifamezim.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///34049515257.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a086b4598e4---3843271351.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f8152505c---tozizokexidofumufajakebo.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f462ed714---mipenisusogakojefo.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d2d790728---53817572063.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/2nj6p69fqfumb0hh2pfnvgnun9/xozorebo.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/62909265630.pdfIn PDF document text
    • https://norservis.info/files/files/57990137482.pdfIn PDF document text
    • http://cityfate.com/files/files/vavipewikoripobizanatuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=honeywell+lyric+round+thermostat+manualPDF 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_off0000d949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD949 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF160 10924 bytes
SHA-256: d02e0260c4ce7a1368febf9b0965411f4bbf93b3fe7001bef379767a545fdaa7
font_02_sfnt_off00010a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A81 17772 bytes
SHA-256: 443dc2af6536d9056a3aab91ab7f2d154e7a1386209e7835d3e5327200b3341c

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