Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5111998e600398a…

MALICIOUS

PDF

94.0 KB Created: 2021-09-05 17:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4a9dd6d3c27c4cadab65ae069d46c171 SHA-1: 73fe497b8add1ff43ac08ccc07fd596d31fd4a7d SHA-256: b5111998e600398a3e4bcaf331ccf886580bf7837406f7fd20c092e03a844bc0
156 Risk Score

Malware Insights

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

The PDF file contains a link farm designed to redirect users to various websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish for credentials or deliver further malware. The embedded URLs and the heuristic firings for compromised CMS uploads and link farms support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075ff754f712---tisunarosinojukitipizot.pdf In PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/79048317500.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160da951449d23---92735053112.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/bomodififo.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/a8c6baa48584ff4fd3750970e3908aa0/tobobebitetijipadib.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/sipexujepeputepitafepanet.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/96183929745.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-29/20210429120906868975.pdfIn PDF document text
    • https://groupunsur3.com/contents//files/33371889387.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/0e62679257591fd1d28fb8204b477caf/bekexabepavavifar.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f303c563d0---95237134460.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/496a13e2dfd2169d43f59550071db7cf/boveguvup.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/zuwaxami.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/aa4e851714a2c02075d588ce2bbf4b2a/24465056849.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/37649926841.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/55780515573.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/raralidi.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/66a939502d02d739a3c4ce09562244cb/59136119481.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/d6vem1rm3pcie5ccr300poafa4/82086533680.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/62681304608.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/4565036101.pdfIn PDF document text
    • https://kawanmto.net/contents//files/giduvesulavivesoxazolit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=export+pdf+to+excel+using+foxitPDF 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_off00010902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10902 18460 bytes
SHA-256: ff5f473e5aec1c14195aba534ab56b12f7a7f7ce1c720384a76419b47e0552cc
font_01_sfnt_off0001397a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397A 10820 bytes
SHA-256: db449e1fc898361f0a334d6c34f1d96d14c7f0238e988b6010e0759831af5d81
font_02_sfnt_off0001524a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1524A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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