Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a87d83db8ca12c…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 01:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 293b47ee80af18bb2f8de3e95793cba1 SHA-1: 38ccc5c3415a84f630220d32bb7bd6e203f8147a SHA-256: 05a87d83db8ca12c6be8694d8ce7d54e997919a0bfd522ff3202d0ce0022c393
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this document is designed as a link farm to distribute malicious content or phish users. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=free+football+on+tv
    • http://mtjjt.com/2013/upload/article/files/210904032133049678usv65.pdf
    • https://sanghvicranes.com/staging/media/51786012091.pdf
    • https://divanich96.ru/admin/ckfinder/userfiles/files/tedigajegadejujege.pdf
    • http://rewitex.pl/userfiles/file/56807803020.pdf
    • http://strelnicebudejovice.cz/userfiles/file/5699375616.pdf
    • http://medicamarsala.it/userfiles/files/53786610691.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/raxitawenutirodutikig.pdf
    • http://irollee.com/userfiles/file/59482858256.pdf
    • http://bellina.pl/userfiles/file/96401118471.pdf
    • http://honderhotel.com/UploadFiles/FCKeditor/20210909015952.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613358269f958---wizogopiwekosasumupi.pdf
    • http://noahmission.org/dataroom/file/xidomaxokuzopebexuvawu.pdf
    • http://crmloccitanecr.com/campannas/file/rogovadusux.pdf
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/45303567703.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c387a37d5d---momonov.pdf
    • http://tangiahoang.com/skinkorea/Images_upload/files/vadogarigenuvubexikut.pdf
    • http://maytinhnangdong.com/files/uploads/editor/files/22963662201.pdf
    • http://armanetti.com/images/fomunaxipanurumerale.pdf
    • http://brunagabriele.it/userfiles/files/ninokek.pdf
    • http://www.nagsa.es/ckfinder/userfiles/files/wadam.pdf
    • http://ahrestygz.com/userfiles/files/20210915_154555.pdf
    • http://iltorg.ru/upload/file/57995160229.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/161366d98377ad---dofarojikosapegevedi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da88.bin
71c7ee0283ecaf9953291e97646a6aecdb27522ada0e2ef6b731a80d473db32a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA88 10128 bytes
font_01_sfnt_off0000f14a.bin
cd1f9b8d2e43a0cef66bdbdbec5a56134cb255c9331715919c1228a90498045f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF14A 18448 bytes
font_02_sfnt_off00012102.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12102 16792 bytes

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