Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff963641c88a450…

MALICIOUS

PDF

160.8 KB Created: 2021-06-28 04:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 801be6b0022827a53e160d200efc0804 SHA-1: 2a8941c357f03cf39818272d52d683d65e5b1bfd SHA-256: 6ff963641c88a450c2c57a4ac9a1c0353578a22e9c1ece9b8e1dd6d8c5b6daf7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting sites. The primary purpose appears to be redirecting users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9209

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://nevisnews.com/userfiles/jepubomaxakanudusezot.pdf In PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b89be11e3f6---21395940292.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/d820d2634e2ec877ef78af0194252120/fanowejajozafeji.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/62431654900.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c728ddd56ad---24871268395.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160996c66e7e22---lizafozawurig.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/jezutexo.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608accbb23fa7---zajetinufajujixaw.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bba43dd8f---sowoxelofokitadazedosek.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06a9b4bcfc---tuvumezuweno.pdfIn PDF document text
    • http://momsystem.ru/public/file/9193487653.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/79155349413.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b21c237d7---nomebilikuv.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b65d4cd37b---kukokodaxetopipogurix.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f184c19a97---meberanesekazakujizexa.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///pubupirenodibade.pdfIn PDF document text
    • http://www.ks-zahnarztpraxis.de/upload/files/60432518422.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/31154df5f194f4d38a8694ac190577f2/4158274284.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3b7c125d3---94861719697.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/doluroloxejekijirepafapo.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078fbcf55507---31293185446.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac49826afd---nipata.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/firobinefoseraz.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/69564024616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=excited+smiley+facePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E35 8952 bytes
SHA-256: 084aba20f45b3af06b7ac479f9c47f2f4f04d28e681e3ec8c8cf5ce34a72f99a
font_01_sfnt_off00012090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12090 31732 bytes
SHA-256: 2b7d34ff89e3d936d189fb3b7267c8b53b3707aec52816073c5b38150b11bf41
font_02_sfnt_off00017772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17772 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00018f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F83 90708 bytes
SHA-256: 1a1c8ffa1335738162d8376a32ba6592a3c271ef8078548417904e591024eaee
font_04_sfnt_off000241ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x241FF 10512 bytes
SHA-256: 251f4cefa51730bdea9e071e60cec8da7e55d32fb2921ffd1ed22efce3744c3b
font_05_sfnt_off000259f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x259F7 7472 bytes
SHA-256: 492b2cb08efa4b730599706ddccb632e81bfed33d9f6c91e23c46eab5a9fbd97

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