Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf594aeea2a347c…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 05:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c4ae3f190ecb9e2417db028e9ce1c0a2 SHA-1: 9c11093a0298d2b54eca3a73e043ef6e985f6e73 SHA-256: aaf594aeea2a347c47c010b676fdad2371eda3e36c85119100a08d583618c946
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a common phishing lure, likely leading to a second-stage download.

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.
  • 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://chcial.ru/uplcv?utm_term=financial+statements+questions+and+answers+pdf PDF link annotation
    • https://turbooto.vn/upload/files/vasofolenolibopefemupa.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/zetalevovisax.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/kojojotujo.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/9e0e72bc38a7800561583786f7b11f90/gasukokofozupufozi.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609dccda70b7e---31765285378.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1611f95debe106---8871444270.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/pakuvonaditugaremik.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607079a0bef12---xabigavosip.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/be991682276e89b1add791e0e5a54768/vibovilonojiwiwitus.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/ruto6eoc0sbj2r00dse3rj0qet/95872175108.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/420581a9a282b42e13bc8310db49c2dd/lavotezekogufowepoxitugu.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/waxovuvuzofotewidapa.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/16383675780.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087324c235bb---buduwuwenaveruzom.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/45431676454.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/sutedekalojokiwaxememoja.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/wuramikatixofeverowam.pdfIn PDF document text
    • https://micro-churches.net/uploads/file/duvefugenaxugiwimel.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dca21b44b---99328769449.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/aceb30c515c46fa7b7e6b5e67ec1ec0b/38683042476.pdfIn PDF document text
    • http://hasyo.net/files/file/butisulipuwaw.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8c822b0ae---52304233190.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/42757390970.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_off0000d9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D0 11092 bytes
SHA-256: eb2a3e6476fc5d4bd617de2ae6e4aac983ec3f560ef48084f0817d8c7296940d
font_01_sfnt_off0000f37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8F 17672 bytes
SHA-256: 47663251eba05608264985ffa6bf2f0956424e693f5147a56955550a522b00af

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