Malicious PDF — malware analysis report

Static analysis result for SHA-256 981bce67acd3b368…

MALICIOUS

PDF

81.5 KB Created: 2021-09-04 17:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2e2e857b2e2a25d772d845a66573120c SHA-1: a588d45bdf770197dfb639ca7794d930fb66dabc SHA-256: 981bce67acd3b3681507154fd75f18d7ccb081d82a879ab992735ff05d301ce5
164 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics as malicious, including ML classification and ClamAV detection, indicating a high likelihood of malicious intent. The presence of a link farm pointing to compromised CMS uploads and disposable hosting suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a potential exploit or a lure to download a second-stage payload, likely leveraging JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vnplastic.net/upload/files/55912255841.pdf In PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/qku57c0tka66tq79oabf2t6i2b/dagugazesazaromazuge.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160890e3c90646---fefiwilig.pdfIn PDF document text
    • http://southport1969.com/clients/861680/File/55646228076.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/982ffd6c76194fbca2c1c3f8a7cff2da/70677705919.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/1vv2mmbr5q2jo7bk7jlasgo63f/zediwareb.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/12993258796.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/69140ceb20b9eb7e19eea166450c76cb/48350071862.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/vavafofunowalebofevo.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/g6n6p2k6qfrc86ihifvqc58620/mimulidofovogarom.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/mupajowo.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/96676316095.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/e9c9ca5e0c9273162407ded8cdbbe610/retimatexe.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/41815752900.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/junosasitamutaperoxet.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/q1bd3d7pjq2im12e2i0bo1shl0/jumatoropavusamat.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/9p3cpc2981mdvavfje18chq83i/21112059250.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/vuzimawazupudabelixukiwox.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/sosasoben.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782880c137f---mexijukogiwepepixizigivin.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/jizoridatulaguni.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/71006324655.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/33525124633.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a93b69130---pekilobagegegitefeve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ncert+science+book+class+6+solutions+pdf+free+downloadPDF 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_off0000d914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD914 11176 bytes
SHA-256: 76341686877818fb6ef9c03873861f34dee64f82707748d8a0d35798a21c4638
font_01_sfnt_off0000f339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF339 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4B 17416 bytes
SHA-256: 04bf729918b7e552cf73a0628f549240d8a723d59ee8a8e4024e089d1c40a6f7

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