Malicious PDF — malware analysis report

Static analysis result for SHA-256 8533481bed453b38…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 08:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aee79eb92d4049687e57519efb760ad1 SHA-1: e921280dfb46a3a562a57c68522041ece0588f61 SHA-256: 8533481bed453b38a0e6c44407f7415892a62b78090eebc62f6e8f2ca14f0a20
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via a user-initiated download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=motorbike+traffic+drag+racing+mod+apk PDF link annotation
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff0b2f39d9---lelemo.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/kuwizokubologij.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/wemobedusa.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/47190404442.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/jumezigurojefapiju.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/57661487509.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/bujikobamaforiwibabino.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/0ffb850d96be902e0567a6bca047affe/25833282943.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/70067764389.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/lodibelamuxinebuzu.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/jipebonopatezo.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/98060197130.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/bugebitafunu.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/737c6b03ddb6fa527f1f90abff1453b1/32154155911.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tiridofakuguvopof.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1630550276.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/19046747696.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/napokamudimepude.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/56913545152.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/leratarafe.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/16135431041.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/renadewogopegusex.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/17940232141.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/gorazomuxadaxib.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/25315077859.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_off0000d8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B1 10976 bytes
SHA-256: ab8746c87d1600c6fa1480f04aeff41d07ce7fde8ed107d6b20e7dd56fe2767f
font_01_sfnt_off0000f1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B9 17128 bytes
SHA-256: f5ac97b812a0a4428bde202fd3c5580b458de07f7f86a437fc2664b73dfd370f
font_02_sfnt_off00011ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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