Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d025b49650a078…

MALICIOUS

PDF

74.9 KB Created: 2021-08-16 03:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1eed2a0ef92d1c3991485833e10e6fae SHA-1: 31542531944bb86fd519d1ef91d037ba099763f9 SHA-256: d1d025b49650a078b13b9fc5ece863895130963ae9d863f0f9189d8f3c2f487e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pixomot.ru/uplcv?utm_term=qu%C3%ADmica+la+ciencia+central+theodore+l+brown+pdf PDF link annotation
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/q0cf5lhe5nneaor8bbt76o8j86/66062622690.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/ad701b4cc00787415279ac830ca2a000/welojiperumexijofawofu.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/xinolezasuwitutitokoz.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/a027580a14d950d1152f084f2b9dff2e/xatokodovukulusiwev.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/45093892434.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/fs0hjtqg2vpbcb4lclurof7571/96730350360.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/fae89d2b1a3d119d04d08d93a0ca3d10/91047537351.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/15222541861.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fcc591052ae---dajadopukobitiputas.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/50158063207.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609835a0d7411---muzeteliwokad.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/2768604317.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/fewajikozafifunewixez.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/8celivcp82bs3vjs27hcbabobc/24160843002.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/bni1vd9njobhsp4ighi4fb49h0/33414755646.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/zefogosifub.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/dejuludenuritukalexez.pdfIn PDF document text
    • http://alumnicollegedelunion.org/clients/76066/File/76760307190.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e253045887---41774934397.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6dcc67ea9---20815770600.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/mupajofutit.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/69140754812.pdfIn PDF document text
    • http://www.polni.si/Images/files/xedidekalugubupibugi.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/tiq8suo789vbq4dm6a8fqrbk94/891134622.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_off0000bd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD6A 17620 bytes
SHA-256: e4dfe8e5b39e870bc02a1e5d01008dda56fcde0e3e4916ab4b6201cb6dfdfa07
font_01_sfnt_off0000e998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE998 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AF 11164 bytes
SHA-256: 9978cec304d44f5434a346826efdde954930fbd9704d2935c49ca37ffedecd85

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