Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab2831e618ffba12…

MALICIOUS

PDF

74.4 KB Created: 2021-09-06 12:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: df546476aebb5e6509aa75e6d641ec50 SHA-1: ea8d0384e45c001858610dedde87e8de4035365f SHA-256: ab2831e618ffba12aa8a08c46418a4126eeea9b4c5801cfe970da9dce78b3d10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many hosted on compromised WordPress sites, directing users to external URLs that appear to be part of a link farm designed to obscure the ultimate destination. The document body is heavily obfuscated, but the presence of external links and the heuristic firings suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://queure.ru/uplcv?utm_term=bond+portfolio+investment+and+risk+management+pdf PDF link annotation
    • http://fashionflutters.com/ckfinder/userfiles/files/regaregemuvusejorip.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765b7205d25---sarevosibi.pdfIn PDF document text
    • https://loctra.net/userfiles/file/zazawimosobu.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/649c41e0f0cab68ed48f7419ae4db735/79956353317.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a698d103f4b---37445072119.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/34217128715.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/36068609821.pdfIn PDF document text
    • http://srlamn.com/clients/0/00/00e84243199fd86ca7c15d66a0237eb0/File/fumozibuv.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/5411b72bc41a45f3b257602db1dc3ed4/dawevokarafoxironodotemo.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135b841d3dbb---52146915098.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/tebuvitiroxejevoraz.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/77379371923.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/fowebolo.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/jiliwiwubidejaxitazokake.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/42d5b0ea053c98d86b97e24a9d6dd8ad/buxifujazaweg.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/56cec38eb41adec60a537eff4f372a8d/zasisirifeliladeku.pdfIn PDF document text
    • http://dges.in/userfiles/file/melewip.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/9d71b4453f261e8e7a969eceb3b8415d/68241101855.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/55550878563.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/43355196303.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/gijadosukojujo.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/9075c7ed253a8f3d6cb22d407bc103c4/vozedosijovexewisogorena.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_off0000c2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACB 15560 bytes
SHA-256: b782ec01a784021f36b78435d198c21a7da128622e57d640ea25fb40bec05978
font_02_sfnt_off0001023b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023B 11052 bytes
SHA-256: 504bb897357bf1498175cc447f1da04ae2c64988ba5587eeae5351053a1349a1

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