Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c16a9893d58286d…

MALICIOUS

PDF

77.9 KB Created: 2021-07-02 14:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e94627dd0f3b47d55dab72e173f6237b SHA-1: 02537edd887bd279a67e059fc6919553af470299 SHA-256: 9c16a9893d58286d32e516e41c44a9c7b9491c05b3a072e113334e94ae7d59e8
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous URLs pointing to compromised WordPress sites, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16079a391c50b6---zoramago.pdf
    • http://bagliodeimille.it/userfiles/files/93294060749.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160861188c86b2---zixonezojowi.pdf
    • http://www.sport-konyv.hu/userfiles/file/sosodifebasuwoguzinovale.pdf
    • http://sentezetutmerkezi.com/upload/ckfinder/files/jazojufowero.pdf
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/84e5c174e4567ac7d80b21404015dc40/50051393494.pdf
    • http://www.celso.org/download/xekezori.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1dd2d0020---17384593876.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb23ed2d42---tajibipofekak.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/93b72d58fff604053120caead3d0c3e5/12862320681.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/43d1a6725cca55213ab07e7383b5d1e6/51800483053.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f34d46ab49---fijukevikosefitefabi.pdf
    • http://vladjurnalist.ru/archive/file/8800570208.pdf
    • http://librojuridico.com/aym_images/files/pimoridopobuboditebu.pdf
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57558480556.pdf
    • http://tetraeng.it/userfiles/files/11639619368.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d34220cac---83370237493.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/04c9ca3a7a4e39c50ace7d2b70a56a43/38652547071.pdf
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/nofuzesadakepopowe.pdf
    • http://vo23.ru/upload/file/60049353564.pdf
    • https://imad0c0.com/js/ckfinder/userfiles/files/zibuselufamem.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afbe69b7fb0---tewonimovotosugugawefagis.pdf
    • http://beergolfers.com/blog/images/file/43794283716.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160824d185814d---3946578228.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/dc2cclvgb6odqjlgvlaebbb17r/14240063827.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=mr+e%27s+sports+cards
    • 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_off0000cc92.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC92 16792 bytes
font_01_sfnt_off0000e4a9.bin
0d8085af8ae1ac7130c6d6756861f3a4e9f60cdb1da53a57d01736088d8acc22
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A9 10292 bytes
font_02_sfnt_off0000fc08.bin
16a7201ade3e26b652957a8194f05ad3bc8b833bcbb64e154c5822326200c91a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC08 16964 bytes