Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e5b92a71a2ddbfd…

MALICIOUS

PDF

79.7 KB Created: 2021-09-04 06:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b95b17d2fdd0e751e575b1d25dc5e02b SHA-1: 9b67c8f0822bf3194289ba9d8a470ebde38ea3b8 SHA-256: 3e5b92a71a2ddbfdcbd509d05c517e28ed3cdeea3e243327e3d2089c1f3e12d2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm to distribute malicious content or phish for information. The presence of multiple distinct hosts and UTM parameters in URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ketchas.ru/uplcv?utm_term=jurisprudence+pdf+pharmacy PDF link annotation
    • https://tlproduct.com/userfiles/file/toselividakubi.pdfIn PDF document text
    • https://phunhai.net/upload/files/junuseje.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703299a1397---53367394621.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/nomubarasarofuk.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/88155600414.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cad9d5df4---30279432655.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/14543662758.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/zosofokuv.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/54292443264.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/172262771.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087719df3c1a---69635158191.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/nalalafevug.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/41344759792.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/5c7456ecd463e20919c5665e0f117a4c/75461339342.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/b7f3c39f60cf49ca1c5a8e37b4bbb8b6/depavewusaxemegober.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da6875bee73---zamijeriwegugoboji.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/8e9o857tjuidf1qrvc7l2gqhtq/25816655482.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117bd5773c1d---mudototomewilogupolalus.pdfIn PDF document text
    • https://gazelletr.com/userfiles/files/daxitedurepejuw.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/d57561400042fa00e08a1d075b012841/gazijupopil.pdfIn PDF document text
    • https://mauspro.net/upload/files/budogagofowatixigoseg.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/771996a2f8e7d99bb02c9cdbcff32db6/mololajajepowaven.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_off0000d1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B3 18428 bytes
SHA-256: c5cfadccd15d74562c9b7b47862ac8c4c1f17d590907c41c95dab3456617a1d4
font_02_sfnt_off000118f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F2 10824 bytes
SHA-256: cdccdf3a71b7660963636aa2b9b8067c03a97925b11a0aef020f0b5ef852c452

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