Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eb0b306d9c65352…

MALICIOUS

PDF

79.4 KB Created: 2021-09-02 10:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 9bcf293b44b5d0fbf69e57f4e238422e SHA-1: fc535e69aaf05e75abe229d38e67ef63563b1f50 SHA-256: 2eb0b306d9c653529df0c0f529cc92366d543d9e9c809e4c0df05261e38f3d44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vaitinhdien.com/app/webroot/upload/files/banarew.pdf In PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/alebe2s1fin1le00g8hm4qovbk/90345055878.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/wiruve.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/gtm01thvsacif5g4rn5a414nd0li4da1/46451574578.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/xuledomenovufiduxeli.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610334ac11795---87777794545.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16110b7939bab0---98656870366.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/24996281417.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/99783363136.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bfc6ca562---23654337750.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/tibigoxa.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/53221893461.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805d91a89bc---83044558870.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/14672797539.pdfIn PDF document text
    • https://allianztc.ro/files/file/17861268724.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/lekofixanobajegak.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///92592320330.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=the+red+wheelbarrow+meaningPDF 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_off0000d203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD203 17608 bytes
SHA-256: 685a1fa2cb32446fb36087ef698b7ee2cc8d400576d263dc4e2d807a69d475c5
font_01_sfnt_off0000ff8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8B 10620 bytes
SHA-256: ce89295dd319ba5194034bc665d54697d76814025ee9647e9fc69ad9bcd614bb
font_02_sfnt_off00011762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11762 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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