Malicious PDF — malware analysis report

Static analysis result for SHA-256 c950e849529bfe93…

MALICIOUS

PDF

71.2 KB Created: 2021-09-01 17:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f45142c614815f26664ced445b7cfacd SHA-1: bf1142a2c1ffb6de6726aabb21a2fa46b42b3214 SHA-256: c950e849529bfe93d940d37b1c195ecea6816f242f42a236263a814e693e4e23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains numerous links, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The document body is heavily obfuscated and unreadable, but the presence of multiple links to potentially malicious PDF files indicates an attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31ec111f5b---vademegibezixefana.pdf In PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/21b1762464603a751bb011c1862dce18/vurotiwelixewi.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/ganazekovitoxev.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/ece84298afb04342ebeeea65c8b3dfd9/firoviwogixul.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/dazizuvinubejekajejemo.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/zozojuvatunazex.pdfIn PDF document text
    • http://biafrapol.pl/pliki/file/80691169144.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d62b6e6fcb8---61205671760.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160864d3dd680e---sedibisupoluveda.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///vilulofefiraxofizululon.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/kemebitarofane.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/9q3fna92844cf2404v037d0m4k/bixufegumimatek.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/miluw.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/6g2qhttpukt4a6o5pbp554fggn/67406980778.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/81c50cef4aaa1b06598d310493676eeb/lexoderoxug.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/pobituzijarifigorejofus.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797c3847698---miwulelatatorososilidubuj.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087c47b7652b---kuburidokikapabaroguv.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/f61098e879481afe66c8092808920065/3396576395.pdfIn PDF document text
    • https://progin.swiss/ckfinder/userfiles/files/93079790380.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/60700618512.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/xoxilenoxenefafapezivelon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=no+stool+for+a+weekPDF 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_off0000b997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB997 10164 bytes
SHA-256: 10bd8ee5a96e189086668af61a4c106dcc1751c7f46ec2eb8a6be96556de23f8
font_01_sfnt_off0000d0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B5 15560 bytes
SHA-256: 7f6ac64bbe6c1e4c0514993c7b0e17f47bc603e768b93e48674cc2893f0fbe2e

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