Malicious PDF — malware analysis report

Static analysis result for SHA-256 483d80e39ebcfc3e…

MALICIOUS

PDF

91.3 KB Created: 2021-07-15 22:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e33c0241799d54b0ec44771ddaad046b SHA-1: 4eb41f2a2199d8c9ca06bcf55d88f5f80456f0b7 SHA-256: 483d80e39ebcfc3ec5cb0cb348816dcc0512b0da38e64174c8611e70ba718776
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. It contains an embedded JavaScript stream and functions as a link farm, directing users to numerous URLs hosted on compromised WordPress sites and other disposable domains. The primary purpose appears to be redirecting users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • 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://ketchas.ru/uplcv?utm_term=windiest+countries+in+the+world PDF link annotation
    • https://artlabjo.com/userfiles/file/33189077239.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/m82ed5jhkoqq953odchdjjm9re/fazonoposisobujiriviz.pdfIn PDF document text
    • https://oversaslogistica.it/file/21175935737.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/e3321a25ed15654a0ac00dd339d3245c/laruwadujozisedefekivuf.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee090ea002c---lodomakozeb.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/1186839350.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/tafubogokoxadoxa.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/40705258431.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607280a7461b1---jebutumabenujumiwosixawa.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/27274700166.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/d4a5f14de6feb629fdcd0ea0c82da38c/91106541951.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/72245429611.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081d3eb90b0e---65744881882.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/xedifitarelebejatumigaki.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/37816109137.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16077d09569a82---55021877802.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/50291948023.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1b2de5158---tozijefisez.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f583c2aa1a---1903173499.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1e490ec05---85386063170.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a716074660---71006995004.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bd9ea5061---sexekejuxelelenu.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160755c42cc7de---12475168306.pdfIn PDF document text
    • 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_off0001050b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050B 10484 bytes
SHA-256: 8c0e1774967d039fb54dd889ac6376b4df236fc6133836dd45fa8f3cb56802c2
font_01_sfnt_off00011cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD5 16612 bytes
SHA-256: c04b4042eeeea5ab7b5f73edebdd600143357bb02d6bfd96228854de47901d56
font_02_sfnt_off00014808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14808 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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