Malicious PDF — malware analysis report

Static analysis result for SHA-256 76997d52d0287306…

MALICIOUS

PDF

87.5 KB Created: 2021-08-15 22:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 5d7807ff6e7f24f020ffdfe6fb38bed1 SHA-1: 01c1d4a157b588ce74d2ddadbed99093ed95853f SHA-256: 76997d52d02873062f89ae6f99d965c0f1711feba5f11b79ae0ae0b2cbbb80a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or malware distribution tool. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure are consistent with attempts to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • 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=telecharger+plan+bateau+rc+gratuit PDF link annotation
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac3e32fc09---85818958203.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/jiwobebegazovuza.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/64302804422.pdfIn PDF document text
    • https://brmc.jp/user_data/userfiles/files/56643703453.pdfIn PDF document text
    • http://martonelektro.hu/files/file/34061343473.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/22254f1ebefafe3c5734ec87c73433ab/zugebopelineziz.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/80202308672.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160af9745b2408---83022648766.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/vumetipulumowavovumakar.pdfIn PDF document text
    • http://palami.by/images/file/55994017165.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3691d84bb319e914fdf9a7b50dc255da/59217564787.pdfIn PDF document text
    • https://orrizon.ru/images/file/kamugodofisanosojo.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/xiber.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/puwaridobonuzegamul.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/lorewevenilo.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/58065195818.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160717d2c9b0b3---gibepowakepavuwi.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160850c554d68f---39864135999.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/dac61f758b23fd4586f60b5d24d68733/gulesusamilewidupuko.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/37483537696.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd68290980---zakanijizojutuvunedos.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/2355174151.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/lefiponotusafuxotadi.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_off0000eec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC3 18604 bytes
SHA-256: 2699fc63ac960264e40b11a5cf7fc2e6fa1e216cf5b857caf1dbb16d00684cd5
font_01_sfnt_off00011d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D80 10568 bytes
SHA-256: a66524f55a0e8193833b4554d7595d952fca2ef2e9640bc773fe325e6ff1226c
font_02_sfnt_off00013551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13551 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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