Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c1d4708aab5c029…

MALICIOUS

PDF

87.6 KB Created: 2021-07-23 19:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 900af08d3ad9477977d027664a26d221 SHA-1: adcd882e8fd4ee603f47d0aa556796a46c0a7ae9 SHA-256: 6c1d4708aab5c02966d0217b62caa38a1e71322658fb247012fec9316e7946bd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malicious content. The structure suggests a link farm designed to obscure the ultimate destination of the user's click.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16072f25835375---85544127518.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15df5724d0---morinego.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/8c6vbhgfpajreldeciqlv2fuve/nabafoped.pdf
    • https://feldmann-spedition.de/pics/userfiles/file/kowovogutamamuwaxa.pdf
    • https://mangonebike.com/uploads/file/sifagumilisolix.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/26595c9d17ea8f437548d2862d35c6c3/530043443.pdf
    • http://kondicionery-lubertsy.ru/upload_picture/file/jaburuwalalonegoxijigovi.pdf
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/85540534786.pdf
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/rrg411qos74cnpfo8m2233ih7f/bikomokidazumebipap.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/db1f7766e25104562c61a3b73c1cd325/xuzudelikoxewupipuwik.pdf
    • http://www.nomorcantikjoss.com/file/texus.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc821a6e441---90814558867.pdf
    • https://desense.eu/uploads/wysiwyg/files/mopatum.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/ddfe56a5a14d3e3b8cf62489b5ca1200/ditinawelogavovonudoteda.pdf
    • http://naturabliskociebie.pl/userfiles/file/pawadapuvoribisanavakugev.pdf
    • http://littlepearlbooks.in/data/eimages/file/zegubulelekine.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/8a2539ed3bf1ee884bcd80ada4900c6d/32015113214.pdf
    • http://runbo.net/upfiles/files/16252944364225.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160736dd2531b2---13926288001.pdf
    • http://vimbark.sk/editor_uploads/files/93660252354.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/2effeb0496f473a63519932131ac129e/rupoxag.pdf
    • http://romanakladatelstvi.cz/userfiles/file/bunixul.pdf
    • https://loctra.net/userfiles/file/lepetusigovusogogejisodiw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=dibujos+a+lapiz+faciles+para+ni%C3%B1os+de+10+a+12+a%C3%B1os
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d178.bin
4452d0ad75428ba814c4f00340599209b1f1f4ff0d53aaee8301c146c6a331a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xD178 18436 bytes
font_01_sfnt_off0000eeb4.bin
082e74f4075f1e349768bfa89ed8b6ec5184df77ae852957a5c37c68b04b771f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB4 11444 bytes
font_02_sfnt_off0001096c.bin
9b94276e591cbc37e8116991f478551e25df4e5447f2c87b7d7218f07d550e03
pdf-font-stream PDF embedded font (sfnt) at offset 0x1096C 17168 bytes
font_03_sfnt_off00013519.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13519 16792 bytes