Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf47144ab2bb511…

MALICIOUS

PDF

88.3 KB Created: 2021-08-18 17:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9067f95b82f955d4a4e976f5275813b3 SHA-1: 7a478d4ae95989670d134e86c74400f3d46905b2 SHA-256: 1bf47144ab2bb511737b755ddeb89a25b383615bd05651033f7edae490674418
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution scheme. The primary goal appears to be directing users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=ejercicios+de+palabras+agudas+y+graves+para+imprimir PDF link annotation
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/0212938l2eqdrcd7gail2jdpub/roxifevikobekuvoxuf.pdfIn PDF document text
    • http://pinxedien.net/upload/files/xofulopimepefoxokuwebozo.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/kizaparavajejeda.pdfIn PDF document text
    • http://ipllaser.in/uploads/74993325988.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786adece4ca---nalogebobaxudoreresijoxut.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2623f83980---44827511335.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/sewuxurelugiguwirijewipa.pdfIn PDF document text
    • https://morabia.fi/images/file/vunulutokadav.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/18233756409.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/49714728169.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8353368afe---dobore.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/rinadoguk.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/dibewelojunatotizunumoxe.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/85327137137.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/surisajelaxaxif.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/jizew.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084e6db0a0c9---xamisirawot.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/31300374604.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/rabusomavorarunazenok.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/59400903114.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/pozujezufifopube.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c42ab71fb---40039291756.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/jc3bga7h0dei00145ccnvugtup/meredexux.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/edf85778c6a0d629bd1fedd28e91f4b0/xakevukujuvuve.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beaf3251881---remepizareduvavu.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/58ohpuho7otpuhpho2mj6vsc61/86189007813.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080c1c09d9de---dipadudezi.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD995 16068 bytes
SHA-256: 6d636ebcb28a43c11a0b96216d988d0aaa25e428b847d4e039b2a2a6b6e27b6d
font_01_sfnt_off0000eeb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB1 18700 bytes
SHA-256: 57673be1d4c801f7f5739aaac8dd7fd2dc7ecc95e56ea500608d40cfd889fd89
font_02_sfnt_off00011eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13703 11188 bytes
SHA-256: 33f4462d38a8f2345582e193baabd7c13aaa85ad618fbec00cb3632b221f71c0

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