Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b4acab9b75b84b…

MALICIOUS

PDF

75.7 KB Created: 2021-09-04 07:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 43f86f83e620691c320c9857bc5297a6 SHA-1: 54848f17daed919f51d92cf1689ed905e867e1ee SHA-256: c7b4acab9b75b84bfdb81dde4e45f84a827e59df9f9ba8f96ab34de82ece7bee
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was identified as malicious by ClamAV and an ML classifier. It contains a high number of embedded links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a phishing or malware distribution attempt. The document's structure and numerous external links indicate it's designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/4918bd0acebcca09650d92003522cd9f/ronetojibiposuw.pdf In PDF document text
    • http://netmutum.com/userfiles/file/62677590335.pdfIn PDF document text
    • http://akssert.com/userfiles/files/93046802426.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/35753837875.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/29472110770.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/75830467673.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/golemixepuz.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/6363e6feef6e83f24bfc6db6cb593519/lezemexadogipotizaf.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210815075425.pdfIn PDF document text
    • https://grouptm2.com/contents/files/bizixe.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/41483834429.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160852de6e124c---ximirekumamugugomi.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/lhdk636p6nidf7mjepdsrhcorn/81492927686.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799307e7ce8---19430875860.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/lajunikuwetutasulej.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/bumupukozi.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/os5ivkep8hmqkjvbj7l28unp9v/37008994668.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/25044028688.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e45335864c6---86758744121.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/nevekodawaguto.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/12958663243.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160e565b3b9884---39435266434.pdfIn PDF document text
    • https://zenkenmoshi.info/images/files/file/41852335708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=esquema+de+vacunacion+mexico+pdf+2017PDF 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_off0000be1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE1A 18288 bytes
SHA-256: d5fbba08d9f833c948c2f077e33d47eafdf7705220ce1503c87e6b6b82fa4795
font_01_sfnt_off0000ed2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10541 11280 bytes
SHA-256: c760afec8750fdf58fb0700ee1636b3f8402bb4fdf5a3fc10c39df0256e872d8

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