Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd30ef50d8e910e…

MALICIOUS

PDF

88.0 KB Created: 2021-09-07 23:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a2a19d2065d8cbbdcf9302b05b6f20e7 SHA-1: 0405a03bd69c3f84e86998934656ab3ac780e449 SHA-256: bfd30ef50d8e910ea0cb4f36902e7ada1717bc38fce492e31a0ecfc5fe4e3bd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to potentially compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with exploitation techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://muzeumkonstancina.pl/attachments/file/vodosomubew.pdf In PDF document text
    • https://vieclamkinhdoanh247.com/upload/files/kavumabuwixakax.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/76194873457.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/68045991844.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ctjietohhqhf1qavknttlsfgv6/nilikewuxu.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/1c115624a979dee5848f13cd168042f8/fogelatonesoligove.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d731499d25---nadeboko.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/18775899060.pdfIn PDF document text
    • http://suaups.net/userfiles/file/33457751053.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c1dec40eb32---31023168253.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/44023783599.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613699eab5ca4---43930619924.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ce9ceb252---91175324111.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f8c6188fc---52935368715.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/80413622211.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f8623a3c321---tetajetiposaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+gulag+archipelago+unabridged+pdfPDF 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_off0000f276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF276 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8D 10836 bytes
SHA-256: a9c594bd71827c34f0d47de8fba8e0693c4b09cb71341e7623f6f0a2a83aa9fd
font_02_sfnt_off000122fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FA 18812 bytes
SHA-256: f98a94484c6c5d2ea11e3ae1243e571310d639790c4a22f087522a80ecf5e61e