Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bcc9af9500658b7…

MALICIOUS

PDF

77.1 KB Created: 2021-09-19 10:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 03c9bdbec381af68c73e232391e7e7c9 SHA-1: f99d38cdafaf8a3827f9f1024c6b4759d3d9264d SHA-256: 5bcc9af9500658b7d94bcf3f26948d3173ee3b456cd8702e20ea7c2e10f311cb
164 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, and includes a heuristic for a visual download button. The presence of these elements suggests a phishing or malware distribution attempt, likely using a lure to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://chcial.ru/uplcv?utm_term=ni+no+kuni+ds+english+rom PDF link annotation
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a72775eda5---96709288998.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/69169737961.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/fadozunipovega.pdfIn PDF document text
    • https://zagi.hr/files/96453042962.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/32043612936.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/zufakasesibugolusubos.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/dowedagarowijowev.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb70d64205---foravujo.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/42251659575.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/48001728705.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/sokak.pdfIn PDF document text
    • http://altera.ukrstroyka.com/content/xuploadimages/file/fefewamuzenadeduzan.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b597d9a12e---fefavibumaxotorinaxe.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/55116171305.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/76595391385.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/topixesezujarera.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/63336577776.pdfIn PDF document text
    • https://tuinvandecruys.be/file/gemuge.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/gijutut.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/8981404048.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/xijaki.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/92697863754.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/jesibude.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/87153556950.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_off0000c7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF4 18192 bytes
SHA-256: 0e7877aeb4d7967d297f5ca75906e510203b56e095c40cbcf1a25f334de90cab
font_02_sfnt_off00010eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEE 10604 bytes
SHA-256: 9ceaec6fe184942719692b53d4bff7ecf2fa19a5b80c6631f87bfef9583120a7

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