Malicious PDF — malware analysis report

Static analysis result for SHA-256 481be3a06f43e320…

MALICIOUS

PDF

83.5 KB Created: 2021-08-09 22:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fa4464fef6cdf79ad44da43547f5f9cd SHA-1: f42a785329e8db73b7135e66d73f02c05217425e SHA-256: 481be3a06f43e320b7f31d70481860e9a34eb73d5407690cd9ff3c7827802004
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, presenting multiple URLs that appear to offer downloads, including a lure for 'Call of Duty Mobile'. The presence of numerous links on potentially compromised or disposable hosting suggests an attempt to distribute malware or phish users. No scripts were extracted, but the PDF structure and embedded URIs are indicative of a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://ctyrkolky-gamax.cz/data/dokumenty/21056791745.pdf In PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/3326543319.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/57317362974.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7d465dba6---poxojudijelu.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/mrp9d3l2um939mnb0esc5uq4eg/57183538202.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/22j9v54dro70a5tvs02gcoo5k3/getom.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/6u162vgc3otimau4lnpvfa87lk/80668976905.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff56d27885---jodotamuvuze.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/96549538575.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210630064550.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/vogixowirisaxefizediv.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/32329052646.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b95b15552---biralenufasobedutovolulor.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160abcb12090b0---nupimekopazajajexuvig.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/dededulemubigedif.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/80139894235.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/kojamevojojupaxizojuj.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9afa197cfe---46515512851.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/webuzivesifok.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/384e092cf6c14ad1c6908615383acf0d/gijagoroloviwexelubewojug.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/72456904633.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/dc5b1c512657894f96fe2eba58218abc/jokupugaluropudeni.pdfIn PDF document text
    • https://ckmandarin.com/uploads/89205511357.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/37474042590.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=download+call+of+duty+mobile+garena+apk+obb+terbaruPDF 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_off0000e124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE124 11328 bytes
SHA-256: 1106f2cbb32f2095a70ccacccfb4778bf56fb155f480f67ba629953bf91f7436
font_01_sfnt_off0000fb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001137d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137D 16888 bytes
SHA-256: c49695598e74852bef7d4673d8979803041cc1a52f9cc4b572de113e6a72b3ec

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