Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7471b33bbd13b26…

MALICIOUS

PDF

79.5 KB Created: 2021-09-19 01:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 68650bece00a09c2ef9d141ad1911496 SHA-1: fd20e174916fe2f5672954b5d49e6f70827cbbc3 SHA-256: f7471b33bbd13b26582bd0764d7d3f06e8cdd6ae3a5436e32eff516e31bbafdd
132 Risk Score

Malware Insights

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

The file is a PDF containing embedded JavaScript and a significant number of external URIs, many of which point to compromised websites or disposable hosting. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host phishing content or distribute further malware.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3358

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://coretry.ru/uplcv?utm_term=sistemi+operativi+android PDF link annotation
    • https://pacantioquia.org/aym_image/files/17729440416.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/38300049669.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109121520255844.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/55375437993.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/tukakop.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/a0e6d0bd9c38cbbd9dda216e39cdb664/58326850176.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/93383934846.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/satufesuwemuvagugi.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/leninakoxaxubaxufere.pdfIn PDF document text
    • http://chinazzjx.com/d/files/79913349069.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/16474898178.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/57640053790.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-17/20210917003218108597.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/gasitiwi.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/7eeed61fe6e4e7b03014195e80e78899/badatuwepemebulu.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/71006543856.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/dakapasija.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091905441638.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/rixoxirejidoselibidep.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/78305404095.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613426b8e55e5---95383277948.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/2cegg173a2k7h2vjfccqbsi2v4/ruvoru.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/95252338979.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10114 10648 bytes
SHA-256: c40c1125354489271b964ba111fa5681c6c10094c9104863f098472d1fcd87b8

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