Malicious PDF — malware analysis report

Static analysis result for SHA-256 f94d90db725e82b8…

MALICIOUS

PDF

93.8 KB Created: 2021-07-02 20:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9aacf160ab767df1947a67364a50211d SHA-1: b71760e584d3630c712ede68ca5a7c04612b77fe SHA-256: f94d90db725e82b82c882dccbb86a7c623bcfabb621579c1d6ca75981a8d3c1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous URLs, many pointing to compromised WordPress sites and employing link farm techniques, strongly suggests a phishing or malware distribution attempt. The document body is unreadable, but the overall structure and URL analysis indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/ccb9f7c39e94f56a7f708866331dd720/xadufapimu.pdf In PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/5aee709090cce7598ecbfd572084667f/fovejalevaf.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd10f769cd---zugisatorab.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/89254891238.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acddb070215---wupemugurumarul.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c10a7e68169---zazukevuzitaparopezejami.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d3e53b323abefedaf0cdf3ebc7ed4186/78014817907.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/2681184367.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/8226433213.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/9190813844.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16085514d89d70---80763268145.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/68768489673.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/7av11pj0le1on0k9fvvh9l8kdj/42190630960.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/94412833990.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/84cdbvhte91hei30g10blvfpum/65118240347.pdfIn PDF document text
    • http://asvpp.fr/pdf/biruxuwilenazivape.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df0fb672f9---raroluvokopoko.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210621081707_899807853.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bceb7e989d0---92151848282.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/63484679410.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/tclj5u8ied1usp4lcqd88ig9k4/wepemevejitavepejafo.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/61863636180.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/40439636684.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/bunufexevagan.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/30050032223.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd118f3abfa---wekezewolewekaxuvuv.pdfIn PDF document text
    • https://susta.vn/userfiles/file/54324345821.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=before+formed+in+the+womb+i+knew+youPDF link annotation
    • 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_off00010a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2A 10828 bytes
SHA-256: 540b7a032772f0862f91f92728806dfa5c435d07362b1b6068dce03beaf0d615
font_01_sfnt_off00012304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12304 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B16 17240 bytes
SHA-256: 10e4f0eca53304a255b880b4e6effeb284392a4941ef8d91d03b8f67d2e7a5bc