Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ccd80cccc1860a…

MALICIOUS

PDF

86.7 KB Created: 2021-09-07 13:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 64adcbb88dd99336692b6fc9d7be8d21 SHA-1: a9752db3f5c77560f25867568247e22ecabdc9f9 SHA-256: a9ccd80cccc1860aeb3994ede9ac14b267132ae150c147461a3a7efda8000c7e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, and the heuristics indicate it is part of a link farm strategy. No scripts were extracted, but the presence of multiple suspicious URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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://queure.ru/uplcv?utm_term=pre+combustion+chamber+pdf PDF link annotation
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4e0aecde9---15681457164.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/wisupe.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/41286911822.pdfIn PDF document text
    • http://kmsenior.org/file/files/85005714844.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/bibidelodesezites.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/3674724209.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/toradudowatavugetufave.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/526bbb4b05f8cf65f5c59060102bd466/75953835365.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/sirebo.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/2l4lkg04hcs0upiqoq1i6bdh96/6686515381.pdfIn PDF document text
    • https://nilsagame.com/calisma2/files/uploads/maponatelozejemesotuz.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/43180775958.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99f7906429---15766518555.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c38673dcde6---lipeva.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/879a63c29bd2155c614ecd3b517cde22/11514436779.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607748591ff60---66580692904.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/22429159224.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/f6c800c1f50d1972edb8219fdbd28b9b/50926131106.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/39423058548.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/470245271b4bc8549b39d0b4d45375c5/disewiv.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3811815ea---18293742456.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/jerututu.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6c7c70540---sizokutagulipemitanajivar.pdfIn PDF document text
    • https://wodgluch-projekt.pl/userfiles/83318731260.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_off0000e650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE650 20560 bytes
SHA-256: 48f581707e0fac1361712c83ff1939990f8d5c898406048f2d249aff344060f4
font_01_sfnt_off00011b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B74 11080 bytes
SHA-256: 8177d9fc4052f80c64e41c29218efc29c0308547261e6f4ce11f239fc7b283a7
font_02_sfnt_off000134e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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