Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aeb6d5d206578ac…

MALICIOUS

PDF

81.8 KB Created: 2021-09-02 07:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f1449df337786d596c71bb54e5699ef5 SHA-1: e58cfe3146bcd067c01bf5fcef38bd66587f86d8 SHA-256: 6aeb6d5d206578ac44c77691af8ee326671e7f2481202f5714c39ae0fa11bd7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. It contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS upload storage or appear to be disposable. The primary function appears to be redirecting users to external content, likely for phishing or malware delivery, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://atdawnwelift.com/userfiles/file/gizeposimusesux.pdf In PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/30050360355.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/jisujepukinexivujuzoli.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/sijudawamijevo.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfb1facc1b---kajifaj.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160872e661cebf---30026554408.pdfIn PDF document text
    • http://telektrans.hu/editor_up/raxegarexapemo.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/b3f3eg06uva98q7plev2cjarh9/81758772153.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/17240115386.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210706_BAA9A09F5E4493A1.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/wexovuretujasux.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa32aef2d86---91958175415.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/doxofajabebosijikiw.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/laromoxulimulitibi.pdfIn PDF document text
    • http://gojjang.com/uploads/files/16125788453.pdfIn PDF document text
    • https://kaimano.it/file/52889074547.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/8123424641.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/rusubepapegoter.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///xabuterulimobonekeliriba.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/85209230367.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/fosetodofujemitepiboli.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202106/file/wizajo.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/42299533339.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c816eb48ed---rutiromozusi.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/79885211664.pdfIn PDF document text
    • http://biatlonbreza.sk/editorfiles/files/kariwopomexaduraxowuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=sketch+the+graph+of+each+linePDF 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_off0000dbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFB 16932 bytes
SHA-256: a912be2ba93cb30af3a44135ee27bf643ecf28d49e3085e4e6eb1ad5a3072559
font_01_sfnt_off000107e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E0 10756 bytes
SHA-256: a0b0fbf988d40508865e6a79385ea1efa8bb542f8e622d39b163c602e897ad98
font_02_sfnt_off00012097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12097 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1