Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9722c8d023f79b…

MALICIOUS

PDF

94.0 KB Created: 2021-09-07 02:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3e0f1a772feec78e8d5ae834f16c71cc SHA-1: 000413a08efa32fde695336a59e2fc7d776364b9 SHA-256: bc9722c8d023f79b4956cc5bbea2367f435d61f5375c00c73039fe167dd204cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous URLs point to potentially compromised websites or disposable domains, suggesting an intent to lure users to malicious content. The document body is heavily obfuscated and contains no readable text, preventing a more specific analysis of its lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/34168714386.pdf In PDF document text
    • http://email-database.info/userfiles/file/pixidoxadixifiwew.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a2b3dcb76---78116461733.pdfIn PDF document text
    • http://soupworld.de/upload/file/56095800268.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/doduripagoxemozine.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/71175187192.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16098a6784cb2a---xezododibede.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085665a94dff---batelemafike.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/kijalivemulib.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/wezodulewinakewezunevuwi.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/feruruvigig.pdfIn PDF document text
    • https://hgb.se/filer/file/43238344064.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/lejifagidemeguzulitat.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/88209135036.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100152b040ed---4712989229.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/gutizoxokefolodugusasukij.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/av0nv4bq7d7ckp3uolp3h7apgm/8555061348.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/86442693453.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/r0g123pfcv1125uvf0cp44j1f8/xexufopebebupomixavukazud.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e28abc0a17---58302077701.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/63220777901.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/ecdb0fb327553c4ecbd99b1737ec3d5a/butemigodixabonaguvogufa.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16083348dba8cb---roxujavo.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/6445536054.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=sistema+financiero+peruano+conclusiones+pdfPDF 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_off00010150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10150 21172 bytes
SHA-256: 3d93855b0b1ee19036b8c631bafb6a408beda41a5b22a34c198d0ebac27d3b54
font_01_sfnt_off000138ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000150c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150C5 10956 bytes
SHA-256: 569dfa8b9063f2b795d3f54e302fb5089b4e56122a84bafd9858d5c79824cce2