Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9138ad434fd24ae…

MALICIOUS

PDF

74.4 KB Created: 2021-09-07 06:34:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a5f03eef5ad537bb5a940d3873149b71 SHA-1: e4477a7c43f8a46893c584cc4ac8aad31783f367 SHA-256: e9138ad434fd24ae0214441ade2836ecad4dea1fbb5129aef96cac68b6dc86c0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and malware distribution lure. The document directs users to install a browser extension or update, a common social engineering tactic. While no scripts were directly extracted, the presence of numerous external URLs, many hosted on compromised or disposable domains, suggests a phishing or malware delivery attempt. The document's structure and embedded links align with techniques used to distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://laborke.ru/uplcv?utm_term=scriptpro+user+manual PDF link annotation
    • http://zimmerei-possert.at/tunimumobofegi.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7be8b4602b---84016435706.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/mumegifobeles.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/0fc744625fed7a55153800bb98d473fc/8620319326.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16098b871819e3---peroximaja.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/lajelo.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/28185040718.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/8535d0f1cdda8dbf379d9b25aa850100/17395161673.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b774eb133---39431470637.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/11885269496.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764a51b2210---kixomukilib.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/99212494606.pdfIn PDF document text
    • http://brmc.jp/user_data/userfiles/files/12614299926.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/kufuxodokez.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/5e838e0f87ad861df9a5ca39cd7746fd/9252041622.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5666c7c68---79162660149.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5049d0201---2119684694.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/47060784367.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/72692341668.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610590b77fc4b---nikuwaferakogisix.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/377664fc5e60c7985968682e60589448/69606443521.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/wekotase.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/58161547634.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/67858777983.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/65180068849.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/gemebukedesugob.pdfIn PDF document text
    • http://calisnt.com/uploads/files/zopokadaneruvopakobi.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_off0000bdd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD5 10712 bytes
SHA-256: 97a7e275965eb31066dc1162a23d5ab04a2c14a7dc52c6c38aafba2bc42adf0f
font_01_sfnt_off0000d663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD663 17820 bytes
SHA-256: 20ecab693887e049594a3bde28b8d9e26600c849f81aa107a2833df6fd3a45b9
font_02_sfnt_off00010443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10443 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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