Malicious PDF — malware analysis report

Static analysis result for SHA-256 1528c653fecb8700…

MALICIOUS

PDF

87.2 KB Created: 2021-08-13 11:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 56e8b56dbae54e5e330bb737904b081e SHA-1: f80b51023cc72557c3f1fcedf812d05dfd3ba9ae SHA-256: 1528c653fecb87003a300fa533d028f7431c193166bb0548611d2782eda8c7c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting it functions as a link farm. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or spam campaign aimed at driving traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://garglob.ru/uplcv?utm_term=can%27t+send+files+via+bluetooth+windows+10 PDF link annotation
    • http://rajskiewakacje.pl/userfiles/file/pejaributog.pdfIn PDF document text
    • http://scro.ru/pic/file/bululagida.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/jebopulixosigovunawevuraf.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/895101511.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/fobefusinibe.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077571ce3524---67123158397.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/b8pmois80m6sq54ddc962unhc4/67186797639.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f57126d7d885cd5658e190fd7b9c354a/64741828789.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/717a5dd04ea6484760e2386d7cee3310/bawufodedenogoti.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161045cbc31539---63838250599.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/66902456032.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4e5e3fe01---21222799330.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/79283564374.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/b4d21a7cf33f356170c8c7c6c2b6d71d/dutofiju.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a89d114f098---kisozajidem.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/76d020a182fec91aef933d458b76abc5/niwizadanemajek.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/vetuwidagarudajamikem.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16115cfd2d0a6c---75101050489.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100410def8bd---36454766517.pdfIn PDF document text
    • https://la-klamm.org/Files/files/21107833330.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/680ace25cdf0ede91498136bed9cb5f3/tekixisofijopaninitokavo.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf167da995---22888063857.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210805104319.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_off0000ee26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE26 18676 bytes
SHA-256: ba40c4ac7349e73c7fadff6b46347adbd2d1b3d04946163e054c0b4c69f11a26
font_01_sfnt_off00011da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA8 10980 bytes
SHA-256: ae1c221daceb0b40d7fe48cec7c87b4427b45dbf1e9fa4396c6d26541fc4ddd6
font_02_sfnt_off0001373a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1