Malicious PDF — malware analysis report

Static analysis result for SHA-256 e201d105eea6650d…

MALICIOUS

PDF

80.0 KB Created: 2021-09-16 12:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 80150977b175fc50378751eff13e23f7 SHA-1: a1acac9d908bd60f4ce0c0bca1b41d8064577ffc SHA-256: e201d105eea6650d0a1c3b0f71b8e8a6d8cff8e7d4574c40efedce6af664719b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to various external PDF files. Several URLs were extracted, some hosted on compromised CMS platforms or disposable domains, suggesting an attempt to distribute malicious content or phish for information. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ketchas.ru/uplcv?utm_term=plenixclash+server+3+apk PDF link annotation
    • https://marosme.ro/hirek/file/metorolokamog.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/xevonukesijadepanezuxe.pdfIn PDF document text
    • http://lovesenergy.nl/file/85983547949.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/vezuneguvopig.pdfIn PDF document text
    • http://talesma.com/E/file/sadojesib.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161383fb16befa---xuresuru.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/94859771382.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/naledinovulabititidano.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/wolage.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/5825502600.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/tgssk1ec5129t222j0ga87pmnl/34519935373.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/zitavilojus.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/girukisid.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/14860287898.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/45412795063.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/beritewijoz.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/g18lpppckgok5lnk2fmh6n6p86/zitobizedo.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/43949864637.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/xetisalufunotenep.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/44494751163.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/mqb7ci4m0rrovl0lte1p8dv6f8/75317066820.pdfIn PDF document text
    • https://superlitefan.com/uploads/files/98210410222.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/0945bfc7bb4dc61ea4aebf4b1607bbd6/29276446465.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000cf85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF85 19168 bytes
SHA-256: 1d5a4ca948e49ef13c1a93f27461bc5abb3b63753e571b632bc59e813587350b
font_01_sfnt_off000101e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A00 10684 bytes
SHA-256: cf043a76d03f486ec5c31a8c8488edf1eca8e51db089bab54175b69eab5746fe

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