Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e8b2859e5447976…

MALICIOUS

PDF

76.2 KB Created: 2021-09-24 10:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7346ca8444400acca0e8db0207ecd9dd SHA-1: 6bc10e603435c988d9946754f00227f8f0925037 SHA-256: 7e8b2859e5447976ff3b08bf7eff6e1f1d173969b8b91b9dae32b8764b9faffe
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristic analysis revealed it functions as a link farm, with many URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and compromised CMS upload links reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8530

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://cructi.ru/uplcv?utm_term=fifa+19+apk+mobile PDF link annotation
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16134de63f2f35---57560659188.pdfIn PDF document text
    • https://edarky.net/data/file/pubatibeti.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/16638356472.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/5506964307.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/12460618554.pdfIn PDF document text
    • http://goref.ru/files/file/66324427157.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/kenerulexemoj.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/10566465236.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/66415662810.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/55068287749.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314448228c1---47553796494.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/32468064696.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/gufevuzisuseger.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/2978283011.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210919181849.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/50528411199.pdfIn PDF document text
    • http://dasbluemchen.com/tonakapasabozuz.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/758f03dc21de29426e32257053a11102/xejusatox.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387ce0c1482---32923248869.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/57374042611.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/161348639b669e---josarexasegibiwanosu.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/19227900882.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_off0000da92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A4 17592 bytes
SHA-256: 46467b79cb70a5baca5dc8fe21f1a5e3acc3bd76030ec987da31e20aad83ee35

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