Malicious PDF — malware analysis report

Static analysis result for SHA-256 202f5646762073bf…

MALICIOUS

PDF

87.4 KB Created: 2021-09-08 08:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 89ddd812fb5a67fb606c2a9669eaf81d SHA-1: 474b1cb2143b80221cf7a97d7e055486fbc69d00 SHA-256: 202f5646762073bf86414c54d50a359015424f90ffaf128b0fa7ac9938dd64e4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for initiating malicious actions. It also contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=form+1023+fillable+pdf PDF link annotation
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080ea14d5dc1---fafetagevenuje.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/40808209309.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/sifusa.pdfIn PDF document text
    • http://reunionclass.com/clients/7469/File/piromufinewejilikas.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/80370714389.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4d185003f---zatojixinijopujogizu.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/tuoc8s6bc2vf9bbjt23aefgvvn/13897035811.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/70606644690.pdfIn PDF document text
    • http://chinalabware.es/d/files/jolofuraziwoxebe.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ac53bee12---laduxamanuxunaxef.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/604dc0016f9fa67f0213339c4f9f30e5/batosifupepatepibozed.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/depiredelomopojuvas.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/49755370328.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/gubeg.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/21448227135.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102c313ed0d6---mudegipil.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0047f33f59---9465305858.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/81090614745.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/sckmjv7rle5n9h0msbvm3cgn00/fupupesuvazefug.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/76218626589.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/daxofimebotazetosu.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/65324247945.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_off0000f2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EC 17052 bytes
SHA-256: b1e98401e3f323cde6fd6d43b9064f9e225be858c684ecc35f7e771b9023520f
font_01_sfnt_off00011f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1C 10872 bytes
SHA-256: a6d6f760b7a5c3127512ee96cbd8a22f09825da9b927df0b9b2972aec259df4f
font_02_sfnt_off00013808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13808 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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