Malicious PDF — malware analysis report

Static analysis result for SHA-256 d95e66f69a2557c2…

MALICIOUS

PDF

161.1 KB Created: 2021-08-14 23:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 3a15a23ee8a7ab8e26b049b6b15767b1 SHA-1: c6b5bce3e59d0821cab2bad8e61596b216164e12 SHA-256: d95e66f69a2557c20da34facee7499de84169ce0dad8ec0ec5943522d832762b
164 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. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting a distribution mechanism for further malicious content. The presence of a 'download button' lure further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c10e31f68---sejezerimasojerajoxag.pdf In PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/18142180134.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/8446965531.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/94419275830.pdfIn PDF document text
    • http://herve-coiffure.ci/files/pirugegapidumikegilen.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/0m5df3cv3mavkd9csgnrsbk9tp/japafajaduzepemerewagal.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/lulananoloxebogijinef.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/9e5ee6d8c894851acb639b9e58b29556/rurukineki.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160915a13e5127---wilisit.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210624_033256.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/vuvogexepag.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adde5cc8ee---61949979757.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19402119758.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98716083407.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/namikewifezixizajuded.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16080503c9330b---88821931087.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/zediveposorigabolakijuz.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/68490593986.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=d+c+heath+and+company+worksheets+answers+spanishPDF link annotation
    • 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_off00020e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20E86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00022698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22698 20176 bytes
SHA-256: 21cc73aa0661b6601d97519363af8f5c8eadbb629d794ac5f0e59ab9ac4b97ad
font_02_sfnt_off00025ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25BA5 11024 bytes
SHA-256: b1ef88c1a8236b7c57ddbb669e591dfc9ec4ee071196618cd8d34f04fd82ebbc

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