Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5bf89ab38679b90…

MALICIOUS

PDF

76.2 KB Created: 2021-08-16 16:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 37a42fff88cca54371bab1d82ad5cbe4 SHA-1: 48ea52975afb57aa0c70380146bce8f7c9a12c2c SHA-256: b5bf89ab38679b90b77b3f8cde5ae96f25e1387044820f82645e6ff2e055e69d
154 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress upload storage and other disposable hosting sites. The primary purpose appears to be directing users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6242

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 https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/4debd3fd1634d37f1a4d9eb17e877df1/14101060312.pdf In PDF document text
    • http://rymwid-training.com/userfiles/file/87284653945.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3297ba3b00---nanusumeka.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e5ae31eff---30369050679.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/35764254814.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/jenofuxepugisexasota.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a540644d9a2---podezorimid.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/larinasadike.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/pg3hfjqd8sec296r7dql048tq4/somuvelut.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/fopezubo.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/zasubazeno.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/lazoxodir.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/52176544746.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607588739e129---zuvegeradamobalule.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce18f568f19---13033552766.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/warusataronalukilabunuw.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/a158eba114821d7dc6ea0ec909ec1b9e/pewevujere.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/duxebepigujigufazifuliwiz.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/91044062162.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/c6a737j705o9qi6r0qccbs2p5v/33560432731.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160df3f215814a---gozazomapowezewej.pdfIn PDF document text
    • https://ip-pharma.net/data/files/podajikuzebuve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+write+a+letter+for+being+late+at+workPDF 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_off0000f10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10924 10532 bytes
SHA-256: a88bde9ce48f435c662ad720bbadb23ec19ba1b51e7a8ec0ebc5b95e916be482