Malicious PDF — malware analysis report

Static analysis result for SHA-256 4015b4aabe5ddceb…

MALICIOUS

PDF

82.4 KB Created: 2021-06-11 10:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1ccddd1a6e646f02c9c9b1a79c0745b6 SHA-1: ffd3f9f4ffcefc741a7549e9e0a6cd3f1cc05c1a SHA-256: 4015b4aabe5ddcebf425a02de784e0ca1117cf64962c87b4bfbe7037bb24ffd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nomylo.ru/uplcv?utm_term=upbeat+gospel+songs+2020 PDF link annotation
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/79800e7ec5c24e54112849570353fbca/xifis.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a75982c27---27322374313.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a880e9150---40626635231.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b8c261018---99582176937.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d8a3888a7---xanebexeg.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/9660a7a729cfd1a821d02b1fb557de22/17412483191.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16091185edbbac---37038036429.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/feb4b3600ca8082006fc539e6783cea2/51754200175.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bfccbc182ad---zuwoxemezepozoderu.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/67012968267.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/wekenafexivalesetej.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/vodotuxiroroxusupogen.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/fa239196b725d96acee86d705b730173/71966914839.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/jemajazufutasem.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/wopozaletudofativeruzages.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10601 5296 bytes
SHA-256: 96ee8ddc8b37d98108c2a0337f66a36a82cf0af19c8c32f5a584625585467343
font_01_sfnt_off00011816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11816 10644 bytes
SHA-256: 29197bcdd2e740e98c6c888b43607862ab4baee2dc4d5f73975c854bcafc323a

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