Malicious PDF — malware analysis report

Static analysis result for SHA-256 930b4386a7073dec…

MALICIOUS

PDF

93.8 KB Created: 2021-09-07 09:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aabcbda399abac856efb1cd04b7d2d7a SHA-1: b08216ab98477c6c9eed2a239be53670c1942967 SHA-256: 930b4386a7073deccfda2e53e3a0b5852d23e47dc3184ebd1fd701587c6c85dd
124 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to lead users to external resources. The ClamAV detection as 'Pdf.Phishing.Trojan' indicates a malicious intent, likely to trick users into downloading further malware or engaging in phishing activities. The presence of multiple distinct hosts and a link farm heuristic further supports the classification as a malicious lure.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2534

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://pogotowienaukowe.com/Upload/file/6070884921.pdf In PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb21b9980b---wesalewubibojaraveve.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a82d4b35ae0---binamepatijibediriweno.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/80803171037.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728027c6c05---fewupuvaro.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161192313683a0---pawijazup.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/ruxolof.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/44830690626.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/mufofegobux.pdfIn PDF document text
    • http://handgun.ee/media/file/kividakotilav.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/nigiwesovifura.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/mikenakitakaw.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/nuxobejodajilejujape.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/tokorejaleludolixite.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/sulanapibixufop.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160821a14d6148---63212320374.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/faralofomorowale.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/88554125331.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/71ad0367d75738da0655da864fd921c7/tipukisirufemuxelu.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/79525819100.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/ginulidurubaroxutol.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/39401451329.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f3c8459ab---putawabukarasozo.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/witenesumogozemeranenedu.pdfIn PDF document text
    • http://samtle.net/ckupload/files/56843835792.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=scar+tissue+book+free+download+pdfPDF link annotation
    • 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_off000117c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDB 18624 bytes
SHA-256: c94c910f7fc51a117ac394fdc9507b4f55dcefffbaa4055557e0e4d70f2a950a
font_02_sfnt_off000160a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160A6 11108 bytes
SHA-256: 06e5d4eafcb7bbed2e78d8aad659f5730d29a7beb252ee40c13aa725d88c3b29