Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ff67bfd211d74f…

MALICIOUS

PDF

77.3 KB Created: 2021-07-16 18:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e81a2358855365d388ba93eb20a831c SHA-1: de20aad06b496e3c527d74d81015d62b06b81462 SHA-256: 90ff67bfd211d74faf60d79a63505b0e835822a7df32363aa59f2ba5a30e9088
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links to compromised WordPress sites, indicating an attempt to deliver a malicious payload. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of a visual download button further supports the lure to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b95f5abf170---deluwu.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607957f2c1231---71884174465.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160e6cd81c9936---8832649180.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dd37f0c93dc8c3bb5c431c3e39b2cc9a/jokivaralomunuzenaga.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e84c1444b7---leger.pdf
    • http://myapartment.de/web/editor/files/penedinutida.pdf
    • http://acpiindia.com/userfiles/file/nefewofifevezukagut.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e8da55352---87902981495.pdf
    • http://gocreate.termall.pl/upload/fck/file/10716722917.pdf
    • https://sealskinz.ru/files/file/bamolorolumepawonulo.pdf
    • https://ecoretras.com/file/59420280600.pdf
    • http://rustproofingottawa.com/userfiles/file/44901949274.pdf
    • http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/16878980353.pdf
    • http://galluccifaibano.com/userfiles/file/92477011894.pdf
    • http://paintmaster.hu/js/ckfinder/userfiles/files/41164473676.pdf
    • https://ryokanclub.com/FileData/ckfinder/files/20210701_AEF5E457CC6BC7FB.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c2fe31ea---gufulaselajufuv.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d0049f96e---mibakanikurevakezasaxapu.pdf
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/sajugifodokagodopem.pdf
    • http://dok-vo.ru/userfiles/file/9576355988.pdf
    • http://marthomaiticherukole.com/userfiles/file/45614379956.pdf
    • http://luingpyrex.cz/foto/Image/file/84169593683.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160837c89b1c02---soxakeromuxedamirela.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/ec32c163d1a5c7e203c4482a8c5d248f/12131227794.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ce73b7tmchd2ajg88jce5s8li1/rewegirugefowuxitegubusuj.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=download+ebook+emergency+couple+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_off0000cc3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3F 16792 bytes
font_01_sfnt_off0000e451.bin
4174f0fdb3725616b076ce9359f5aa86a95b164ec0b81c5a9702c0b7a99636d6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE451 16176 bytes
font_02_sfnt_off00010e37.bin
191b1631464d2e3f4c50c830288f931194dc36e1fbec700a91e82ae556166630
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E37 11140 bytes