Malicious PDF — malware analysis report

Static analysis result for SHA-256 c685713d5a1d2e37…

MALICIOUS

PDF

101.5 KB Created: 2021-08-12 08:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 02757973fbba3ef91b5ddef355382d30 SHA-1: 552acc47e294bd2d43befc0f34b60f5de183607b SHA-256: c685713d5a1d2e37947df76b4728db873b6a8d38e1de91f313858b2c6349f02d
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a phishing trojan by ClamAV. Static analysis revealed that the PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. The presence of numerous external URIs and a link farm heuristic indicates a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2805

Heuristics 5

  • 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
  • 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://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160850c47c68a9---suzorotokibaniripez.pdf In PDF document text
    • http://villabrown.it/userfiles/files/39439483682.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/c2a995f34c1007a00ee2b5c7596439ac/nunajikorevegikifokoxuk.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/0b2047788e50f4fc75e4b83848077e33/xilevikuforujin.pdfIn PDF document text
    • http://freewest.at/punikomoboxatow.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/sosefamixirokolevivoxol.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/202a28dacdfae7f617bffc211d626dab/43416624957.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210622_225309.pdfIn PDF document text
    • http://status.cz/UserFiles/File/65702882191.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/c31a23946bfb36caa5e4c456bc85a010/72843045921.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/e5182e820077298b5de18965008ecf6b/21754577223.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/rhu1a9d51651f09406j05j58au/57537669173.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf98291b718---93060152372.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/nobipopexeboboto.pdfIn PDF document text
    • http://robbes.nl/media/files/fijumibike.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/pobop.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/2a3ceffca8088137e656e637da4a18cc/58993264340.pdfIn PDF document text
    • http://agrion.org/upload/fichier/73395380347.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/vtuv647so4rombfh8omkt28jh7/29298929800.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/lepipipekub.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/redokevubufozotu.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/45131337133.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/kaxebazezadazop.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/jalewimiwobowosuxarasafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=gamefowl+conditioning+methodPDF link annotation
    • 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_off00013af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF5 19476 bytes
SHA-256: 4ca23beb1843c3b068962364973db1aceb96ea87cc8ff3696ee325adef257095
font_01_sfnt_off00016e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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