Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a0952489c3e181d…

MALICIOUS

PDF

95.7 KB Created: 2021-06-30 21:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 280a2b5df9dd32b563c251d764b747c0 SHA-1: 1076d74160d3297da065cd8a8ee71f131c196a6b SHA-256: 8a0952489c3e181d4e701dde34a2a547f87d304f39cf6cc3f29018e994b2e42b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to other PDF files hosted on compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the link farm suggests it is designed to lure users to malicious content, likely via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • 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.
  • 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://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c980385620---60938376316.pdf In PDF document text
    • https://netshopnepal.com/userfiles/file/kokuxuzogujulabelefo.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6aa5ae04621b675d6e8990466012ebc6/44098543871.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/429ae1c7664248d3578115fc59af4e21/87923374127.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/91442809e6a799ab77d5290d0aa47e9b/deseveviz.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/kexuwarogab.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a4ad701d5db---28780181490.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607caa8eb87ba---1781037047.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/vinofu.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/97475595052.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a457df8c97f---24327782430.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/777996fc2ee7314313b3c6787a781e43/4258175615.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/ac9e2601204011051846641425ea8262/wobomidufupuxufamirujabid.pdfIn PDF document text
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/29552776711.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7503e6ebc8---16751935442.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/004b0fd360b8ef8953cb5ce70474f161/69432207652.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bb16737f735---80325513268.pdfIn PDF document text
    • https://mytopics.it/uploads/file/94742757914.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/moo50r8ak008129f43cj8s5ta2/16211508349.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/f396b2b147571e362b8ce73b9645f9de/jijararamipevufagetaxir.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210626215734.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/2ee2d607d82400eba42f32644b7b209d/78356079361.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/9ab2ec1992efd7d55b82119a3043e3fb/lovomozizutilejeseliziga.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871aa3180b9---dowenipiletikojer.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16087cc9320109---74034610034.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=forest+of+the+blue+skin+wikiPDF 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_off0001135e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B75 10544 bytes
SHA-256: 3412ff74bc3778260260a1befe8157785ea9a01ca895d86dc2f7c6e93667066a
font_02_sfnt_off00014370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14370 16996 bytes
SHA-256: 53473f1939200dce3a749eba4539a90fbab62fec624d596ee14b4132b6ad6bf3

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