Malicious PDF — malware analysis report

Static analysis result for SHA-256 a498ea5d3f62a7d8…

MALICIOUS

PDF

88.9 KB Created: 2021-08-25 04:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fed3481d222343fde67fbee95de0d496 SHA-1: 56dbab6c1862baa10f0659141aa7954212155bb2 SHA-256: a498ea5d3f62a7d87364b6eb5bbee3fd23290cc31f783f6e812620cc862577b6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains multiple external URIs, including links to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the 'Fake invoice / payment lure' heuristic strongly indicate a social engineering tactic to trick the user into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://krisoc.ru/uplcv?utm_term=advance+payment+against+purchase+order+letter PDF link annotation
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/50432f22d2581181501970e865166706/21954194792.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/nitotamonobejesoroma.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/puzuzimepiloxi.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3a4c7f029---69871065512.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/11845791448.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbddbd13bf---79626134734.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079d8b455622---xepikivavivanise.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/xupipixalujeliwubulakivon.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/vulokekilerutij.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/suzidojuzezogibinawapi.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d062c7e20---76750438448.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c649d8bb2---62697074543.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/kakibomorejewatux.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3ab9d52cb---10341726061.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160feab5b19eab---4825346779.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb4f5df72c---xezeraji.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1629153206.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/46694044310.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/zopawibi.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611c82bce0b18---51528410709.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/73762332073.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/66595633692.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210628180353.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/doxenatavenaxilem.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_off0000f89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89D 16300 bytes
SHA-256: 892996a05d4f62696fc545718a7f5655cb413451e78b95c89978ef35bde6c8eb
font_01_sfnt_off000122c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADC 11220 bytes
SHA-256: 5049c87d8ac4db427340800a6786344ff19caeb7e50dc6b2b302b738883cfdcc

Open this report in the interactive analyzer, or submit your own file for analysis.