Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6185f5b040350d5…

MALICIOUS

PDF

78.6 KB Created: 2021-08-09 07:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 0d1b99c10bf609b832d835382d9a1dfe SHA-1: 7cb8e3aaf8885c2acd602aea7daaf563f64a8635 SHA-256: c6185f5b040350d57459bb64b358b0fd985d393f329bc84bb7e23e11b2dfbf1f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including links to compromised WordPress sites and disposable hosting. These elements suggest the document is part of a phishing or malware distribution campaign, likely using the embedded JavaScript to facilitate redirection or payload delivery. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://queure.ru/uplcv?utm_term=how+do+i+change+the+pin+on+my+genie+garage+door+keypad PDF link annotation
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bc9fac915---60707083856.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086aea3e2a00---figosebasuxifajuze.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc667e3eae---42575557015.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/a039a90adbffb644d1244361efee0f6e/21374855296.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/10618402615.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/p1f826tshkedefaqdlv0ku1lo0/bafawalewafusi.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd238ba783---69228708282.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/goxeboboban.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/godelivipeneperiwiza.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ougjt0h5c2sef25kau6uaqfc3/69826437551.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/20553605197.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa35b519bb3---29768492520.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075c7f7530cb---sivimodirefu.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29b6c1c8f0---38732918163.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/a1d471653ce81dea80f33c530fca0c6c/ditiwevofaworavalofitepu.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/vefis.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/27714000347.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/sibsblsqo7ldshmqf05rbfsp04/77323028255.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076bded6ca85---fixavizanojesakipale.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/idrg7qd6bk068b8s3nl33snbet/75252066132.pdfIn PDF document text
    • http://lovemyskindayspa.com/clients/d/d9/d99ed7cf7cbac978b7326c22a81d1608/File/87222191412.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/vonabomo.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/7075298052.pdfIn PDF document text
    • 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_off0000ce48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE48 11028 bytes
SHA-256: 0686f309d6d6c1ff0341a322e0c1f0e5ec2eecb9feff030e063d18d2463a4c63
font_01_sfnt_off0000e78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78D 16248 bytes
SHA-256: 8024ccdfdb398350400aea66c3ba1562e4b19323299117c738f0659cdbaf06c0
font_02_sfnt_off0001117b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1