Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf1d8ba1a25a2a7…

MALICIOUS

PDF

73.5 KB Created: 2021-09-17 19:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d9c9a059964973b0b64ca91972cd9387 SHA-1: 7b1b9c7da7e1da5392d430f507456bc5062c8221 SHA-256: bbf1d8ba1a25a2a7503115aa68b52c5c4e74944cb867ce807339f97d98fbd8a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document's structure and URL patterns align with common tactics for luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://melz-feu.ru/upload/35164285598.pdf In PDF document text
    • https://konyaalotaksi.com/userfiles/file/dazugemusupamonulovuvijis.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/19965085181.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1b4fb1fa0---madomid.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/pewojupatosorekivowosap.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/77348041898.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161352bb0020b7---widojodagotibisuwonox.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/xaxababovezipetukipox.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/lavufokikuwozinanu.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/dotinatitapu.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/96133453778.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/ab50435f71eac60753da272d79d91c7d/49074498167.pdfIn PDF document text
    • http://archbot.pl/files/file/39339139295.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/xekiguzifuxurulexopad.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/47984210917.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/tukezowawavapadovotimu.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/67821492138.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/65247448258.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021090207261786.pdfIn PDF document text
    • https://digireg.cn/upload/2555117835.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/85497364453.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/bolaja.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/12616661554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=constructivism+lev+vygotskyPDF 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_off0000b7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBE 10816 bytes
SHA-256: bc1aa64a094d58ba59317a01a6fa63814fc0aa93699e191ad1d58328299929ed
font_02_sfnt_off0000e8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C1 18264 bytes
SHA-256: 0397f9d674cd2df03f46f2e4adfde9fdabe507ef753270804822a52b880eefb8