Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5fd1fcd368cb672…

MALICIOUS

PDF

80.7 KB Created: 2021-09-08 08:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c3c457eded618297c9b28a09aff911fe SHA-1: 3e123075fb80781b67ad0cf5e84643dd3d5dba78 SHA-256: b5fd1fcd368cb672b42023993e1a677e62b86d5d1802294999a44d9090b66720
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains. This structure is characteristic of a link farm designed to distribute malicious content or facilitate phishing attacks. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://quaint-house.com/4612739409.pdf In PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/nizanegewumeguje.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bab608eb73---45663347017.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16099cfcfa1356---53199062156.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/7540912518.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d94e32b34---rinuzofuxazolukutejodenu.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/980234d6e23e4f3ac4a03cdeeae2cb1b/loxulimavuzefowu.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/67287145104.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/59961291084.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/dizuriwetisonik.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb21b9980b---wesalewubibojaraveve.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de8ce3a140f---6195358573.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aca66b9f9a5---83321594375.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/gekusinuvex.pdfIn PDF document text
    • http://superpart.com/files/pimov.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608609714da89---wafejatijimigejumuzimuwuz.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc110e4d52---wunetusepaxiwexadar.pdfIn PDF document text
    • http://hncastlecable.com/d/files/boxejulola.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/un59o2b1qsb3j9ia7bh3e2h4r7/zopenefobagara.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/f07f34702842b041c687f09192142d77/retadeguxefekufevelojitab.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/92638427834.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/83478078152.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/04ef261b38660beb3c597da58c2e38a3/vepeka.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/10116300461.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/utp39k8h7bqodnd5kpq55qno9l/milerizawizanovemabukopir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=canara+bank+education+loan+application+form+pdfPDF 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_off0000d751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD751 10976 bytes
SHA-256: 94ad2905f38caa6297eb70e20db6dca23ff08742207498cfff13771c53d925f4
font_01_sfnt_off0000f090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF090 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A2 17028 bytes
SHA-256: 376bfead7f798aa488bae2a6be0a80ff40d96873e14db45925d24185046667df