Malicious PDF — malware analysis report

Static analysis result for SHA-256 59109243ea1b6c39…

MALICIOUS

PDF

93.3 KB Created: 2021-08-14 03:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ba6a430068cb0af7c574d86812e2a736 SHA-1: a0cc3f49ab4aad0fdfdd44b9e703d8d16cc5e151 SHA-256: 59109243ea1b6c399973735fded141318b584945559f3d7a003f40c550e2d8b2
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm to redirect users to malicious sites. The PDF structure and embedded links point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/2ce134f5cfa680c8d1adcf483f8af424/salejudezatobuxagoj.pdf In PDF document text
    • http://mirai-kankyo.com/userfiles/files/rozudilepa.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/diwujudigerezadusutu.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c46d5f56b07---namodonedujov.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cfd479ed7---19872262888.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/jonobozasamonar.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078be1b62b59---towarexixufeninutusa.pdfIn PDF document text
    • https://churchboys.org/userfiles/files/sepuvudededoxaw.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736778a6e36---bimibesefuk.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/49708997324.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/7c36bb1e50abcac32215e2aa441550b2/muladigivumipixunub.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/bam0b3g321bnnjbub27r66np5n/sejuwuxelekolugafesine.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0282873b26---jivofijomejuragi.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/213967977.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/xudur.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/fd1fc47af86887cac3b1f8c7792d4c25/58849953408.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pubafapevugezudo.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1084a65b1---sonikizorapavajun.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085ec32e38a4---fezarapus.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/mapakaratid.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/58359975107.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/dccfee19cbf6f581fef54c7d0b07fb89/95187824138.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/b1b2im9bo6g3s8avag7sf3imt5/50710087432.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/71070606551.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=poder+do+ritmo+2+filme+completo+dublado+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC98 19692 bytes
SHA-256: d094fec5c4f72aa4f74f1c7e33ad7180eaa4c63ce8e84ae485dbbec135fb7b32
font_01_sfnt_off00011dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC8 10972 bytes
SHA-256: 42cfe1776a400da36cb413f1a8178ac00fd0639b41947d11f27848d255d89a2e
font_02_sfnt_off00013704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13704 16192 bytes
SHA-256: 97e3f73a58ccdd4784c9ae1678d9f90717e6b6d0c87c36bf93adb8865ef65ebd
font_03_sfnt_off00014c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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