Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66b8a62b46dc1a3…

MALICIOUS

PDF

83.7 KB Created: 2021-09-02 11:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3a43b0d654d91bc200029ac4c5f01928 SHA-1: abb04e6dbd4f4ea35b4fd8b4a1998a0e0d553733 SHA-256: b66b8a62b46dc1a346dffa1e2a1730d69f92bbe4437a37d107a5cb1a5da7a9b8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple external domains, many of which are hosted on disposable or compromised infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and heuristics suggest it's designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://nfc.soo.jp/file/28871517615.pdf In PDF document text
    • http://oprandi.it/userfiles/files/19953976830.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/nusati.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/21314725403.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ovak31t4e4f991jackkktlkgln/54321183161.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/tadoluxoraketup.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/0f4lehjvug10vsvtjplh52aur2/76143273080.pdfIn PDF document text
    • http://blueyee.com/upload/file/250838097121.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/mikifozedokerawesafusi.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/bokoli.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/magebokozereni.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/soxiseruvidositapidifok.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/9173021065.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f0686bbeb---26443708188.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/gibigefeliluzajona.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/7358702667.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/kapow.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab6f3b5b75---78829502947.pdfIn PDF document text
    • https://dm288.rs/slicice/file/giguzipoxasexagev.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/buzuvowumejininibifuz.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/48930747477.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/85930017902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=wansview+wireless+1080p+ip+camera+manualPDF 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_off0000e0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D9 10944 bytes
SHA-256: ae3b9fa080f03571a95d45e217b8df6c0f0cebe8d7e3d9cfd8997d5377a25f0d
font_01_sfnt_off0000fa52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA52 18064 bytes
SHA-256: c3b3573003a3df97a8150954aad08624d26ebbf31ea84871053db0369099a505
font_02_sfnt_off00012954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12954 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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