Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb4b608312eabdab…

MALICIOUS

PDF

94.9 KB Created: 2021-09-16 12:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d5a4b67b5c601380f2decab1f05b9d46 SHA-1: cbb29647da4839b19d622f4c771d549c40d680aa SHA-256: fb4b608312eabdab1a05058f2494953aeefadc6658504bd47346ff9542334857
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=curriculum+in+tamil+meaning PDF link annotation
    • http://kossuthdigisuli.hu/userfiles/file/jalusipupuvofon.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/93288016761.pdfIn PDF document text
    • https://seerupit.dk/assens/file/29444712927.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/tefeza.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134cea88e08f---77950882948.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021916347237138.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/94106819802.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/35324878480.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/xunofizazaz.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/xagiwupen.pdfIn PDF document text
    • http://rurisnet.org/images/file/kaboxu.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/muxedixunigabit.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/72439764344.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/lewafeg.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/7624884227.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/035fd2ee84fa701365deeb3bd851f87f/97107815770.pdfIn PDF document text
    • http://indemo.pl/Image/files/rojapejavejedetofafoz.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/fumifuzom.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/xakobutawesagesofatagideb.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/fijusuriberigena.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/pikusabojuzi.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/mojup.pdfIn PDF document text
    • http://iknow.pl/files/file/41345402065.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138460f85622---2350932737.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613b12b79b8ae---53169652010.pdfIn PDF document text
    • 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_off0001100e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100E 10416 bytes
SHA-256: e9ef7edc4bb4113aa99acf136fef3bace06f13084a6f2cdc6aa1bd4ffd1313c4
font_01_sfnt_off0001279a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279A 17824 bytes
SHA-256: 3dd2bf504a0fbb3f93fcbc003ae4065698525e701466c061b042906164d445ec
font_02_sfnt_off00015600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15600 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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