Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c48ba272d4306d9…

MALICIOUS

PDF

79.4 KB Created: 2021-09-01 06:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5d6bc07de21317a81d94402a9585e5e6 SHA-1: ec655a4331b77b9e097366c1b4eb0ed0f48a8b08 SHA-256: 3c48ba272d4306d9676adae75c8aea15a62fe46fbc8b22a912e57ae2b1891fa5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which appear to be compromised WordPress installations used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms suggests an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://nomylo.ru/uplcv?utm_term=ark+how+to+tame+a+horse PDF link annotation
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/6a6ab3c7bfd2ad4b8370a2f7c9d42cbf/meropurepepumobewexif.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da9bd847d3b---5513476908.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff0dee84bc---voput.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/zovunotatufewoxoxelabu.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/90686392684.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/95579353631.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8ggpo139isapqbb7mf70t6j090/lokijetebizusokefev.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/97156f64c11ec78c978437521934b3f9/wuxuwakogudinatekopo.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc08caabde---36580133504.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ed7f8ebaa---83041140472.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/9hklbpa1v912v6hfv0k6ub6ru1/gigitosetaw.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/f3b1769f5ad08253ec87a17b8333e512/peporabunitakuzotoxe.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/tfi07p055ca77kt3blojjamn7j/34239797906.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/57690080693.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/warufavunugagetemigu.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/lonarejizodofamituguka.pdfIn PDF document text
    • http://benetalent.com/upload/files/sixagilevug.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf0df59d10---90754932275.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/6fe71a07f2c3b0d36de8103a235e1f09/63434898606.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/diponaveruzonupefezidave.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/31efd8c676332fba58bbe8ca447a3e55/doluxofujovezumogaxomus.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_off0000d22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22A 10288 bytes
SHA-256: 73ed8905fd460e73af9e702baea3e9b38be839555747fe24cf46e41d59a9ae85
font_01_sfnt_off0000e97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97D 17812 bytes
SHA-256: cdbdeec6f4862f4664d69683bdd350b5ed99ada08f43951bbb339162b0183f06
font_02_sfnt_off000117cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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