Malicious PDF — malware analysis report

Static analysis result for SHA-256 890dcb36260c8f41…

MALICIOUS

PDF

79.6 KB Created: 2021-09-03 15:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 846bec95d5890798118af8a5ff0ad566 SHA-1: 16b90f57e769d88a86d90711f417bf6ba68a9527 SHA-256: 890dcb36260c8f412cdb3b8d62000fa0b6add75b8adeab60bea77d6291fe28d2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The embedded JavaScript and the numerous external URIs, many pointing to compromised CMS upload directories, suggest an attempt to redirect users to malicious sites. The primary purpose appears to be a link farm designed to distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • 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.
  • 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://sibzakon.ru/ckfinder/userfiles/files/69207423120.pdf In PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/obfo2hkhh87koc3mulo6auuv0i/91470909203.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a29c375fc---64269519592.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/fadejalamikazufokowofa.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/xibonexeveba.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/xiruturifanakudew.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/86953053413.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/tadubidixam.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/35810817358.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/41908344960.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16086e12108c6c---lapede.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/megenekaribobixagatonepu.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/731d250c32d9c2fba048089c63f214b8/zenogigegis.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c46e7e089f0---52721244841.pdfIn PDF document text
    • http://goref.ru/files/file/wetumutefove.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dafec50eff---resova.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e39806e3cec---nesagigedika.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-02/images/files/92680244904.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/dobinusevok.pdfIn PDF document text
    • http://tyextractor.com/d/files/95555110512.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/benet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=toyota+corolla+2008+maintenance+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_off0000d2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E9 10852 bytes
SHA-256: 6be8cf591fa4440acbf037c0d6694976695617ebe3ae1a8c4799aa2616d973e8
font_01_sfnt_off0000ec0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0C 17524 bytes
SHA-256: 0848b65f8f5792d3e2d76597a8dfb444c1143750e95483df00fa6dd73cdc7695
font_02_sfnt_off000118b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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