Malicious PDF — malware analysis report

Static analysis result for SHA-256 196d55569d5af512…

MALICIOUS

PDF

77.7 KB Created: 2021-09-16 23:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ea05d7c879ff1b6f61b3e19c4ccb43ab SHA-1: b13056b5e9eb0bd5a6be6772c8b23e5545cdd362 SHA-256: 196d55569d5af512687bb844a3a647c93515d4dc0b90c6d339be82da095b80ff
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 websites 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 through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://educasters.co/ckfinder/userfiles/files/mowujamutobasowiwuz.pdf In PDF document text
    • https://csp-pub.com/stockages/files/budajewetodawo.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/47426048629.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/nezejeru.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/gumipe.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/lupafapavad.pdfIn PDF document text
    • http://rapet.hu/files/miwadurumipupiziniwonepo.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/sikawitefuripojokoke.pdfIn PDF document text
    • http://haai.org/upload/file/23870844231.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/25111487094.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/81587142147.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/43140913747.pdfIn PDF document text
    • http://creationart.hu/files/file/89016348215.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/rinogelitagovuparob.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/92060781344.pdfIn PDF document text
    • http://cmi.nfe.go.th/ckfinder/userfiles/files/22619394118.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/7192277378.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d1d9cc1e9---fawijivugajurozevorapux.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/d1bripqi0nfh5sm4dp2jjnkar6/85304232142.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/50485112662.pdfIn PDF document text
    • https://alariel.be/userfiles/file/sirugosuma.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/lolaxomuviri.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/2a4adf156fd2420d69a60984926b0635/rurusedodofagirazogan.pdfIn PDF document text
    • https://jagominum.com/contents/files/kimukilak.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/24ff58946574450c4c01281bd6aa6c17/bevekuvuziwiromulosupabej.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/7620930746.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/81211894987.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=bypass+frp+2018+apkPDF 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_off0000cc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC38 17276 bytes
SHA-256: 2ac1c76954233b49bbb0c216569b0d5a9d2e246697c4b6c542f14216c1e6b221
font_01_sfnt_off0000f8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11102 10520 bytes
SHA-256: c2e52a1f5c087ed25b95b9f151d12d40ad420336731bbdfecfe30698653fc719

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