Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6ba710e697296b…

MALICIOUS

PDF

72.2 KB Created: 2021-09-04 03:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 33ef048d12e5031a575910fe8ecd04bf SHA-1: 8bb4571fb2558c5ea840646247d50441e18a9856 SHA-256: 4f6ba710e697296b9e9385d9483dcea0e676301367e139bbf50acc6883969b03
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, limiting the analysis to the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/2ac3533ece0dcfdbcc5a489070336ddd/lijomaz.pdf In PDF document text
    • http://meskerjager.nl/media/files/9712970759.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dcfb32d92a---6323062886.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/janolijosujudolaruvumix.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b74cc9f62---mobiluxutulajamijixadik.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/9955151058.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/2747281681.pdfIn PDF document text
    • https://aspirans.com/files/file/mikuxosimugewez.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/boxazikefavulo.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/jedegedeveguxapelon.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d808a1da64d---bixek.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/40444891635.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c03a3a0aa53---pedesi.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160705ecaba547---27568959718.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16091dcbd16c2f---69097406415.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/majitipuvozokulisu.pdfIn PDF document text
    • https://jensbrode.de/files/file/vewimizoluziseloxusan.pdfIn PDF document text
    • https://shiokerbau1.com/contents//files/94306103803.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc41c68a47---22071807860.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/42199873954.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/vuxijosozolene.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-8-15/20210815101438505231.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/tap1s8mvb6enqpog1rm5bq00m8/pepepewerekituk.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/bbf53af3bd1d1051fac5477fb2553f66/pagakaruremiruwozegame.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/xalojigok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=carcinoma+cervical+in+situ+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_off0000b87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB87B 10976 bytes
SHA-256: a7d298413724746a84f1495f3df372023b348237b7aa8f672558bf380c174df7
font_01_sfnt_off0000d1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FB 16360 bytes
SHA-256: 3df8d7c28620a1286e61744e57ce572d5e058dd651811cc2874ff5745f63f76e
font_02_sfnt_off0000fb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1