Malicious PDF — malware analysis report

Static analysis result for SHA-256 005c9befef9c81b1…

MALICIOUS

PDF

81.7 KB Created: 2021-09-08 05:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f3e7cabaffef489f7f8c22f0cde803d0 SHA-1: d98d083c87e4926875bb9c2939da8c920100f837 SHA-256: 005c9befef9c81b119b571724c4c33e0df4043ad8a858733caaf353db9392fd8
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. These links likely serve as a lure to download a secondary payload, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/b83283d967ae3885fae4b79688b876a0/63289815894.pdf In PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/mobazo.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/jozekuruwemagomibafilen.pdfIn PDF document text
    • http://envigest.cz/upload/file/12311673872.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/tolinigefonut.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/rofigegag.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/ripuvipodijipakavo.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/38583087968.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/99143118647.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160896b6093c72---gusewutezeguzesaxofaker.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/90527144390.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/bed6b63c5e8433a924e0490361305d99/xiwojiwogitezife.pdfIn PDF document text
    • http://timebymtm.com/upload/files/xonawigemunitipepat.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/tonubizojidiz.pdfIn PDF document text
    • http://na3.it/misc/file/zatonuwoxariredig.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/7c1di5tmj65obr6jncpmcsd9q6/lasatubuzexonebiwa.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160beda158acff---82374761112.pdfIn PDF document text
    • http://phuongsen.com/img-chamthi/files/binupuxagu.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/raxelovaxejurur.pdfIn PDF document text
    • https://soliangco.com/contents//files/29822203998.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/fatotonijiwarixekig.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6875f2c1a---61961923136.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/xekilebuvefizis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=u+bahn+plan+berlin+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_off0000d966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD966 18800 bytes
SHA-256: adcfef6bec14d0d044d710a217873a752e201bf5b797201d0d39c0a01734dc72
font_01_sfnt_off00010a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A01 10356 bytes
SHA-256: efe179db2fcf00e10bf2d94361df35ed002ce0709ce20cd85c313a8d07665630
font_02_sfnt_off00012100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12100 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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