Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a53a5709fe70eaf…

MALICIOUS

PDF

84.8 KB Created: 2021-07-05 14:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9213c7f8b6b4c7fd1e18a5fb90950efe SHA-1: 68145a22dfda0f78ee4062a50310cc3b26280b92 SHA-256: 5a53a5709fe70eaf2c5b4b326e1d7e3d3a84cd8caaa7eca34f5a84930275d742
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to click on these links, potentially leading to credential theft or infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/27q1eflmmu82rssivgt801uemh/36735662144.pdf In PDF document text
    • http://klefmarken.se/upload/file/nasudus.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/16556363681.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889f462ec5f---42798545486.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/nefagutapopogilinomi.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/nuvijurozo.pdfIn PDF document text
    • http://vce34.ru/attachments/file/mezosaxasakam.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6vncjgm5kqh5pkurieef7mdj34/36562052847.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/cfud82m7fm0cta3qll379m7h1j/98935884254.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/8398638323.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210628_F84C70D2565128AF.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/gutusutix.pdfIn PDF document text
    • https://amblamy.ee/upload/file/74297736459.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/3150b13d104a955b42fa5dfc7aecc02e/44662505080.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8edb8aff4---70368217546.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/72132ed9b797d55f4f74574ff2a7535d/retokopolafonusaxep.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/69355340385.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/piwegaleputigazi.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16079feeda0223---49277720846.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3cc5b03a8---sekaxasolunigopuvudux.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/9b8cdd08527f1a55bf4fd2a79e72a264/62180054702.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a67d540691---18090467652.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=california+standards+test+earth+science+answersPDF 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_off0000e75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6D 16996 bytes
SHA-256: bde4f2ac3b63c6841ab5c258e542be7f5dbe5759994c80c531470a84926d5ffe
font_02_sfnt_off00012b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B75 10688 bytes
SHA-256: f6080fe25fa3bb3188a0581356f64c80c3937ce259db65d7b4b08f5609377c8e

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