Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f42ed2e8d41dcc…

MALICIOUS

PDF

80.1 KB Created: 2021-09-03 09:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5e9a5af65c93c2277ec000f946d84214 SHA-1: 9275a51a2cdcc068b07b2297f00e0f0aa10d6859 SHA-256: c4f42ed2e8d41dcc473bc0479f8ded87ffb7a7b95be5d0953ed0de79eaac4d0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous URLs that form a link farm, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the presence of multiple external URIs and the link farm structure indicates a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://allytemp.ru/uplcv?utm_term=manual+de+oslo+inova%C3%A7%C3%A3o+de+produto PDF link annotation
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/94790114531.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/44102803267.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/11436033064.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/6403372758.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611095f29e341---wabadivupedoganewot.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/5blmruddu0r83nhtnreilp5f8a/78984452027.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162257092816.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/68172994390.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/18105802325.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/48262748298.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents//files/23167877717.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/gejutomuvaxuvifejupa.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/zamakezivut.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f90c53139---1028351040.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/07cf979986facb0238ec2a8e7fa8348a/37806445479.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/puxalemuvowisezivaseju.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/63821732392.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/57474107827.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/66061060023.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/3919c95dc20eefae31f2dd2930652fda/pivamatizejapawoxorefugiz.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/46a21994b3441e511f5a8438099f601b/bikepurixul.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_off0000d175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD175 18596 bytes
SHA-256: 410132d7d332cf7367ff3124092b305c05be7996032803cc32cc2fd64385f4cc
font_01_sfnt_off0000ff6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6C 11008 bytes
SHA-256: dc35a9d1564afdc6fda89eb2f235b0e9e692ac1f2e1c27e54092b7c37f5f0361
font_02_sfnt_off000118b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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