Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a104ef9dba63482…

MALICIOUS

PDF

88.2 KB Created: 2021-09-16 14:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c31bd970f2d8dc9a4dc295ba5b8b38ab SHA-1: 8df34d85167f9856702185c178efe016ef4da2c1 SHA-256: 4a104ef9dba63482939308707e0b2dbbb7dbcadafd65cd519ae816736c009f36
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to external resources, including compromised WordPress upload storage. The presence of a 'download button' heuristic and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing and malware distribution attempt. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/bk7phcfk1pl2n8gij0lak5r9fd/gifipejaf.pdf
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/nuwuferanulaxo.pdf
    • http://tzsunup.com/upload/44810893399.pdf
    • http://bastola.org/userfiles/file/75247141478.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df918d0a55---lemiwijinoxepoxigelel.pdf
    • https://servauto.fr/img/user/file/wodapix.pdf
    • http://digilit.ir/basefile/digilitir/files/75681392597.pdf
    • http://xn--9w3b11kh5l.com/ckupload/files/44675991637.pdf
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/wejafijojejuxevoron.pdf
    • http://hasanmasat.com/ckfinder/userfiles/files/86395406578.pdf
    • http://evevoyance.fr/adh/.-/file/sedofedepenigav.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137e027ef968---tewusutenenovexotozejivav.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613e31caec525---85969084903.pdf
    • http://nasledie-sluck.by/var/upload/file/52127362598.pdf
    • https://festacontinua.it/public/file/70078544238.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614212bb25b28---rivev.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138566fc053e---rasajimajererosovimekuwi.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330f7eb11d5---fezibitepatowuv.pdf
    • https://kozhikodedeaf.org/admin/my_files/file/51763514730.pdf
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/68634861854.pdf
    • http://lobanowscy.pl/userfiles/file/80748818062.pdf
    • http://trongtinpc.com/luutru/files/44509706007.pdf
    • https://hashtag.school/userfiles/file/99748201074.pdf
    • http://apisicul.com/userfiles/files/fevanarujuwezumapofog.pdf
    • https://lanjutpt1.com/contents/files/fiditenegefokom.pdf
    • https://sakkestadbil.no/userfiles/file/61447459289.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=vidmate+apk+download+2020+new+version
    • http://e1pl2.nazwa.pl/busy/fotki/file/bokakaduv.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_off0000ee22.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE22 16792 bytes
font_01_sfnt_off00010639.bin
1073aa22e5d5a6bf0fe52ec46a94213323c82fd0e4b066ce4ed96316a711c1fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10639 11008 bytes
font_02_sfnt_off00011fda.bin
fb795cdbc9de5fa81b76afa6b222e2c6341c5ca3c6ff547cf6bb393d199ba61e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDA 19792 bytes

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