Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b25085f3cf39f78…

MALICIOUS

PDF

112.6 KB Created: 2021-06-30 02:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7b674261dd37bfcec6ce36a30b6231d5 SHA-1: ee684d1cb028a5cc8e53a13e2b6f410edae7b694 SHA-256: 5b25085f3cf39f78d529a8c48074282c9c105b78c3790fe8f4b1e2c655f90c5a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous PDF files hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the nature of the heuristics indicate a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/jisq51gbdbvfpekca3qnkftrus/vadiwox.pdf In PDF document text
    • https://bloomeng.com/uploads/55761704228.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/b3246f4121301eb1a90a3e66518f7ff4/favuzit.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/83236005207.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/87ce5278bb5b15d63e468f4e24704191/revoradumumasozupoti.pdfIn PDF document text
    • http://www.proyecpapel.es/ckfinder/userfiles/files/35960199051.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/dambdbkr5it6v4u7ov3lmvlg6h/57454756681.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608688641568a---23679021919.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160af6a30aa3e8---davutunisavi.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/savudasewolexipatemog.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/441147705eb4c97b1964c3bee8009957/supav.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d289b8a1e34---25445560094.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/22c9e8712da4e55a3d3d0a0cb7974f45/nuvevupo.pdfIn PDF document text
    • http://bvsaigonbinhduong.com/uploads/files/41083159816.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/72750386bb722a647e08a833cca73850/tiwapixodutorike.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/bbbuv8mjsuhu77kt5vfsmbobr1/18589095072.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/dff518b7137b49b862f5b17259921125/40983372712.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/dotonewosuluwi.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/32673392147.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/zivanebefowawi.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/e276f0ec14157e941806f8d6275d2f54/mikexuvobepu.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/6b31d3984ebc50c44ef5e30c9eb6771d/zevage.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607343a79cde4---jibagudefunusi.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073dc8615f0b---8380811621.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/26098507823.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=plants+that+can+be+propagated+in+waterPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E30 17360 bytes
SHA-256: 3bb4feb207d76e3f018f6a0c12a08d7f7ff9e7a3839d8626ba3ac17db7f71325
font_01_sfnt_off00016b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B92 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_02_sfnt_off0001819e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1819E 11020 bytes
SHA-256: c7425256d83a3ee60d8833caa9b53daaad311b04a5c0b14df442890eeed63e69
font_03_sfnt_off00019ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19AD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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