Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7b43c56ca1dc0d…

MALICIOUS

PDF

71.0 KB Created: 2021-09-05 03:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9c7f3c26edd4c497239697617e42b0d0 SHA-1: 44d38dafef4ba62f92c2690b6fba91153f9c7569 SHA-256: ef7b43c56ca1dc0db88d43fcc509eb5a6c6d1debb9bfbae194e79bb6dce3f728
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure align with common phishing and malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://softtox.com/new/userfiles/file/pixuxolavizujotupusumato.pdf In PDF document text
    • http://rentbucharest.net/images/userfiles/vugezunupux.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/f2baf403418374bbef740489f280b643/54906238727.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611d2d25b368f---96493913718.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/2079095725.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/supopazawavivinibosija.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ec412e39a71---larekapuxuwixaroz.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0603/edcadd6def26fc4e2a0f9dd307c6bb25.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111cf17c1d2c---minoset.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/42644978336.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/a5hss7hokekk45a7m7hbqoen82/nunafire.pdfIn PDF document text
    • https://webrobogo.hu/kepek/gabekipu.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/lodumomiputamupavebifem.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/39236079897.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/wudojaxomujuzuf.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/maduxesebevomegaxazuko.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/pamaj.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/nupirozuworozozewesexofug.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/9156d9bfc0216360fcb58b6c1219894c/97015612174.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608198497b108---10869160337.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/ragawefimizofipifibidi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+make+interrogative+sentences+in+english+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_off0000b425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB425 11304 bytes
SHA-256: 884087e2aa8480a93518a03b59690e2c92337053e7fea62d81b69a2e916dba3c
font_01_sfnt_off0000ce49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE49 15844 bytes
SHA-256: bc1b969bf7017661dd27bb05bf3bd2a3e80afcf0e807177c30d445ddddcec431
font_02_sfnt_off0000f670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF670 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.