Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ec94a77154aec2…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 09:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c6cfd9f35e96d5bc8a22c71b462b238b SHA-1: 88ece34a80f3a9d04781b4a49cc1167abe0eb22b SHA-256: a5ec94a77154aec24b0fab94998df9e7919830d0c143f4a22ed1dc08cc5655b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised websites, many of which are WordPress uploads, suggesting a link farm designed to distribute malware or conduct phishing. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=download+dragon+ball+z+budokai+tenkaichi+3+for+android PDF link annotation
    • https://uppersanduskyrotary.com/cms/files/File/dikulurogotonuf.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/dcvr154712o31d8klgtalrkbta/74892875412.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/fixovetidapogib.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613def64383e3---91028310145.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/darikabunubusefof.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/gojonojuwesukojoromiwute.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/91611450941.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/lezuwimemamezusa.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/leporesodinukosuzetubaje.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161307eab1a111---vukelamulizeloroba.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/gojepejapamute.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/mararepokatuwijo.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/66927350689.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/dojurepifadidugevofumaku.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/7f91fcb3f40676d6c7b685def59f022d/guvevosatukupufelofow.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/3549489300.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/xaranonibonufixewurir.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/c87f6e246a83e7b6fd19d06f8460b9f6/mumalabok.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/tomekiripikukobutoni.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/af9a5819cafda390a1144527e529f8eb/tekerabol.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/zujaludome.pdfIn PDF document text
    • http://tzsunup.com/upload/vewarubovomilawonujafip.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/rokapogizajekin.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_off0000d9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CB 11240 bytes
SHA-256: dbbca86d5d8a35cd56f33ad285afc53e764ec6f56690c85b0493d65b2bf3b079
font_02_sfnt_off00010c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C00 17408 bytes
SHA-256: ac20fd284cc3bcd9243ca315d4bc8136480ee98a172c838bada0ca1f4bbd1568