Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b43c0dfd2050dc…

MALICIOUS

PDF

84.6 KB Created: 2021-08-18 23:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: e2dca2552167fb98558924ff788645b6 SHA-1: b0e4aa55bb9f5c58d1cc0e6645268518236acc3d SHA-256: b6b43c0dfd2050dcd745b55ed5e18ea2522f44fc7bfb0f1046b0a45f9ccf3eda
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to websites that appear to be compromised CMS uploads, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable binary data, but the heuristics and URLs are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://chcial.ru/uplcv?utm_term=paper+io+3d+unblocked+games PDF link annotation
    • https://gomaihoa.net/upload/files/6434845755.pdfIn PDF document text
    • http://linza-market.ru/upload/files/xevugit.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/df993a8c8b53e9a2aa13d033b439cdf1/90625785425.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/zimezifogo.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/86768785429.pdfIn PDF document text
    • http://ausafe.net/images/art/files/xitedekosufiwoxode.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/pororazaxizadobilexet.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/10621007831.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608758a7ab65f---gavire.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/dofimotivaxigamikejagime.pdfIn PDF document text
    • http://mousike.it/img_ins/files/lekenilobe.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a173a3849f2---43086988773.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/webisuwiji.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/befegewuwirevinibadil.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/gdvjebfnme0uijbieddcmi0eum/radoxujasekofavolawaruri.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/najuwatoki.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/fc793fd6c04207e6f3555e6ba2cf5ffd/39440564455.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160872173cad78---34424879772.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071b9d746c41---64804356048.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f572d4e9d---92963993990.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/vamijin.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/dudipuwipajozule.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080fc71d3532---kadugejujefidiloduz.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/i526o83tc8g8nur2vo6nep9a12/nodesevoxazoboxiwujap.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609423f1448b3---41689879705.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/rijirozaxoreneviwozox.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_off0000e183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE183 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99A 11264 bytes
SHA-256: 57b6342b1a7f3d765b67029b4b9258ef3f277a16fc4f32895b24334405605fd7
font_02_sfnt_off0001138b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138B 19120 bytes
SHA-256: 8a4890b4ede1cc913a05c793a2304a929a8a410444b5d51698cdc87001c73027

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