Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86cf525888455a0…

MALICIOUS

PDF

87.2 KB Created: 2021-09-12 18:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3350094bd3da58bb3716d21f1cbfc58c SHA-1: 50b2271fe6b484f6b005700df5745bebf9892d19 SHA-256: b86cf525888455a09385a167f88102ac07b0331cfd353f34a71a9da82d5bce6f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The presence of external URIs and link farms suggests an attempt to direct users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/3fe4513287f1b1ac2d5308055409a87b/41998502998.pdf In PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210901_D9C88ED75B57C0AA.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/bifirijutexufarifof.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/davodudifalisi.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161320e9cc466c---46492891101.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/76085935092.pdfIn PDF document text
    • http://sun-tes.ru/files/file/botixipirifiwipaf.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/rerogazimuw.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/19101075209.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1631031309.pdfIn PDF document text
    • http://geoman.cz/data/file/63654161736.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/gumemuluroserizovuwofad.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/47627834762.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/bitokij.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/vifopidegifozuma.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/90147927197.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/1123979454.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/deluwiwa.pdfIn PDF document text
    • http://esipro.be/userfiles/file/werepetode.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109040359451365.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/fuxevazi.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/59205619753.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/80128383539.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/9f756d6f585d95845312e6c72a936398/63445365386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=friday+night+funkin+bob+mod+free+playPDF 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_off0000ddbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBD 11200 bytes
SHA-256: 7f6e8a5d9d92daf6714742f04cae6d3ed890c88a87965afe871f8505335e8d4e
font_01_sfnt_off0000f745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF745 24752 bytes
SHA-256: 46b8320f9f39aedaf5d8a1e0b992464399961292b98e7fa3d704d34dcbcb0dd0
font_02_sfnt_off0001376c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1376C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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