Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b270e908017e7b3…

MALICIOUS

PDF

84.6 KB Created: 2021-07-18 08:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e87b6d0197ce6613d8b83ff7ed936333 SHA-1: a4562164a70cc143ed310bbb7e413d45ee0de12e SHA-256: 5b270e908017e7b3c7f414ade93e307c2caf92fd924d390ff0bb388322eeafef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the structure and embedded URLs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://royalwedding.jp/images/blog//file/degatuxesizedejaw.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebc09c3e66---bowuravabokezesazedabag.pdf
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/4642511647.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/2a453e5268a95dd248a9c368af6b10fb/batebifof.pdf
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/selalelukex.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/76d9dc70d7ef7b440b3e26a59a28f7d8/fakedonimegekugafaluj.pdf
    • http://jjinline.org/file_upload/file/34656693564.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bfcc28e65---19116089906.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/a08fd46c4a0e096db2f7a995439e54d8/45180261151.pdf
    • http://ashioke.com/images/library/File/38278913406.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ba307f785---guxodovesedevijozid.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/f2d765a325e63284d56f3396cba9e38e/kidivosukumazekisev.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b642824ede4---rawotibemijamagusus.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/0242dte0emug99j3of665g50u1/nuvujumosobojozisut.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609608e1b3e3b---fufadigo.pdf
    • http://teleinwestor.com/userfiles/file/zosakavadawesivurerugivuk.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f137e68cc1---9031831731.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075a65b168ef---wavado.pdf
    • http://auxerretv.com/content/public/file/jipexubizemozipatuvu.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/xekamitumaxi.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a581ded3b7---97523091828.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076733337a7a---25603638410.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aecde1e9231---jufoxisokitadizarojexiz.pdf
    • https://aldaserwis.pl/ckfinder/userfiles/files/bisagiwosefubozuminex.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ddd24dbc2---bixigovixir.pdf
    • https://creteservices.com/FCKeditor/userimages/file/80915823493.pdf
    • https://ludifrance.fr/userfiles/file/tosefudes.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=us30+trading+hours
    • 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_off0000e7ea.bin
9ff38f90d4acc9b3e7a9faa00d3296932ed2156b60652f9b94545c0909eecbac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EA 10752 bytes
font_01_sfnt_off0001005f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1005F 16792 bytes
font_02_sfnt_off00011871.bin
e9a5aacfad856064e4531c830ba3d5393efa11cba139ae7dd211849a55c1eae3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11871 17124 bytes

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