Malicious PDF — malware analysis report

Static analysis result for SHA-256 2603af42a59ccb75…

MALICIOUS

PDF

92.9 KB Created: 2021-08-01 08:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2318667d30a30adaeb15c88479adf406 SHA-1: 8a0eb6e7b0883884cdad7d0b352692ac85fce4cf SHA-256: 2603af42a59ccb75c18e342049c821bedc020044d4e4cda0cb01ebaddc8c47d7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites hosting other PDF files. This behavior is indicative of a link farm used to distribute malicious content or conduct phishing campaigns. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721427acb33---29489529102.pdf In PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160921607017a9---65710098637.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/fuxatekoz.pdfIn PDF document text
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/regarozis.pdfIn PDF document text
    • https://hostingyuvasi.com/calisma2/files/uploads/zowifowesoki.pdfIn PDF document text
    • http://congluc.com/upload/files/laxiriwenov.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72237394089.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/68788920834.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608f100b5840d---bifumebewudifunesuj.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f4754615f---16247553390.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/ub0bda377s9l44f9h6c01cuspl/disabizevaribatenez.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/91293848470.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/14629583981.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/9np0534neel4a6c9glv3iqp1kp/49364328907.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/33f3c1u0tihko7lo9ua4d5mnp0/53865461539.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f9bb5986f---gukunigerovexewegilo.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160771bfeab6bd---fobunavanamovugazudowiso.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/5681749824.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/jomusovinufuvotap.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/ropakivigofaruloxideg.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/roxovodaj.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/14989347951.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=where+can+i+buy+real+hcg+injections+onlinePDF 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_off0001064f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064F 10984 bytes
SHA-256: 89480174546be4cedb428553d5dc71b26e063468e53d9ae6195c7809eecde431
font_01_sfnt_off00011fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DB 17432 bytes
SHA-256: bc45c16b4bf899fbf453827f3dae7424d78d32b602e6cf54c882592ccdb5b5e2

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