Malicious PDF — malware analysis report

Static analysis result for SHA-256 cadd4d83e009dc0f…

MALICIOUS

PDF

83.0 KB Created: 2021-08-09 09:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 29a4c0676d98d573a4fb6f329c7aa5ab SHA-1: ab2e947356828c743a589001588f2773985aea43 SHA-256: cadd4d83e009dc0fa8181bf690f74fede20c4292f293ab584dd33a3d955eaaa7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://solarwindependence.com/ckfinder/userfiles/files/motukugedaw.pdf In PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/b8dea2291a7c2fb50b7d8137b4b27747/zubuxek.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/26930877472.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/fijetejosubopujulokag.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/13468b6b6079c7c40bd592aadccbd314/razirovebude.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16098b1f9afd9e---zerakitixomepilixopeja.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f261fde836---nufojavazexaretoxaropen.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/984769666cef221cfdc989602b2b6d52/43894309712.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeaf5be62f3---famigixol.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/c4b6518e6f1e41cd4e75da827c32158e/79399825247.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/mozawurul.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210609_B3204B7F9C66AB6D.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/tisomepabogaxedoziwine.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6ad7b3e21---36773316741.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/wumonatulubatumewixe.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/91546022240.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160995f74a18cd---82326669685.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/d34ttsfi9r6f11qs1oiiqr6m01/12334440628.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/nurepedasiga.pdfIn PDF document text
    • https://bojovicsirogojno.com//files/rutovelasekizijofakal.pdfIn PDF document text
    • https://badrivishal.com/media/13737898603.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/xawusujosuvonaragoguse.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16075ef298237e---ginuferesiwuvetadate.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/bkr8ntpsihrvqbu13bok8uba6h/72646595438.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=minet%C3%BCrk+1.7+10+araba+moduPDF 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_off0000de6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF681 11004 bytes
SHA-256: d43774229ce9677c9c79a9b4e6391bd37dddc63b8be30b1600ed2fe241a1e065
font_02_sfnt_off00010fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCA 18612 bytes
SHA-256: 3bb0b980334b089e199181673c2f5d4a420f66c91dae3c0d02257a6797f8c3e0