Malicious PDF — malware analysis report

Static analysis result for SHA-256 e41c517bcf1f80b3…

MALICIOUS

PDF

87.2 KB Created: 2021-07-21 20:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4a36bccdcffa628d637cc2534ebc75ad SHA-1: 280b433108f0f826c61d442db8e9042782d73f65 SHA-256: e41c517bcf1f80b3c40d6db252817bd7fd2fc07850cf2380b3caaefee9aba2d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting sites, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5c4570e97c---dobigega.pdf In PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872c1ea2740---buvimazodepuvifadizariki.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/39016135797.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c048cfc87---48381578673.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/jusabojetufuwenofufe.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/24844392151.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/babapubazoxizebirebo.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210715_23D4FF0B7F4752E6.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/o6d548t6mtsct9bfft4jqfmjin/dunewajupepedezigepafokot.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084246340738---rirenoberoruv.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/68128389198.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/rfob8j72ra5qn6edfde7muh5cg/53868614864.pdfIn PDF document text
    • http://airfa.it/userfiles/file/80350493217.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/telediwaloxiroziluwu.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/92835169313.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/36140889225.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/namezebowenuto.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607129bc340b3---42788904349.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/k7v1cla6ag4j0l6uhr595ahll2/sewamuxuzelanevinudugez.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/phkoltmcts2kpgmb4dis7ct2kd/gudigibep.pdfIn PDF document text
    • http://dienmattroigiatot.com/uploads/files/37409585646.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/pokoxoputasukopap.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/93177823127.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/tabibedatesewuxa.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/nbtqaeuho83ummbf2nblua0bki/puzurawujipowuruxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=made+holy+consecratedPDF 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_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 10480 bytes
SHA-256: 9d6ac98723f81996ac626c54ef1de6fc5247fc3f6f591c2e0b9e4ab889cdfa90
font_01_sfnt_off00010ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C5 16988 bytes
SHA-256: 790b13d329db3f1f0efc0f7030531fcbc032f681cc8ed7c6b121f95a6716c099

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