Malicious PDF — malware analysis report

Static analysis result for SHA-256 c86c871f53c27de1…

MALICIOUS

PDF

72.1 KB Created: 2021-09-29 11:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 51b7605df9ce9d216aca2093940d391a SHA-1: c6a37dfcfba9b3ab821902b4cb26d3709cc9050e SHA-256: c86c871f53c27de1dee734a3a0831ee6a075e3f84f63183e84b342acb2a04bc9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://reaga.net/js/ckfinder/userfiles/files/49557033592.pdf In PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161392d0aabb89---kajosoletogarenazinus.pdfIn PDF document text
    • http://allycatering.com/userfiles/89292600319.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/d5e72be3b4a98eb9178b75b0c7060026/74949285930.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/9bjvgld70dq93ms8ecvnsn9an9/xonokog.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/voweponafivosani.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/4057971147.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/lototuliv.pdfIn PDF document text
    • https://sunrisemotelbellevue.com/nbloom/fckuploads/file/sijafonazojavamos.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/jidamax.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/7018006520.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/98664938395.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/161510213ad1f0---ximekaf.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/99768794225.pdfIn PDF document text
    • http://bubb.cn/up_file/file/foxulenonexedipu.pdfIn PDF document text
    • https://paysecure.ro/ckfinder/userfiles/files/26184970513.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/stsqlhcpndmj8f32867asu21fr/41303020494.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/fubokusumejofumamubum.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/30055125452.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/pukafafaxomufo.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/78621679797.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/84932333395.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/33272907488.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/suwolutajuxijalatamek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=lep%27s+world+plus+apk+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_off0000b590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB590 17052 bytes
SHA-256: fd7987be2ad88d092786ce0b0e5753dcbaceb27d108c9f59ad77ecaa28c0f5dd
font_01_sfnt_off0000e0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B3 10464 bytes
SHA-256: 530097ef75c23d1b0f9589ea351d0fcd9b94a8aa664e1dcac867ce150dd0c818
font_02_sfnt_off0000f8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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