Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d57adec9af9a60…

MALICIOUS

PDF

92.2 KB Created: 2021-08-17 09:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 555aa15e70fb716a15cd7f28d208caf5 SHA-1: 1a779272d3d08d3a302e9be0e00ec3b263353274 SHA-256: 52d57adec9af9a601930eadff5754dd19c793b9d4e863ebc703c5ae7fb644f31
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, indicating an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://kocavietnam.com/upload/files/2323722574.pdf In PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/60639444979.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098a8ce3541e---zonumirero.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/671e418bf71983a50ec6f347ee087ec9/puwizolokosemefi.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/jd3616shdf0i1asojnvrtj79m5/49594527901.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b7b0344f6---mudonoriwowebakuzud.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/nudas.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a02c8d6d0d---71293529105.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/bazuwumosabu.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/rugegavujubi.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/viloga.pdfIn PDF document text
    • http://edgecs.net/documents/wetowabokitibiwuzerit.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/fubikasu.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608752bf13d81---93465587546.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/55175438999.pdfIn PDF document text
    • https://hagepoorter.be/files/files/17825165792.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8326bbaa17---15142104795.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f658990341---83372469991.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/55668965394.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/och41m3qvgsbuik9ifpmfrrhj4/bobubatenumefaj.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/kasabovamorise.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/452stakq2vvqeb8kpl5cjqphjr/gasomazuzupotezikefewefes.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c037535c061---wapekuzugaguxiji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=free+leather+plague+mask+pdf+patternsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001055e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D70 17120 bytes
SHA-256: 37f2419ee02bcff4627a996e64684ca4e4f9a705da4f680f40402fafbf6cd860
font_02_sfnt_off000149fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149FA 10904 bytes
SHA-256: 73722f9a5aaae35731bf2a8233b048af9a8ab107aae593a91bb965a45505bd07

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