Malicious PDF — malware analysis report

Static analysis result for SHA-256 b45ee48dd2788f61…

MALICIOUS

PDF

86.7 KB Created: 2021-09-21 05:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f45360641e65adfb55cd5c6fff80fce SHA-1: a122839df8c9fabcacaf6978f08362a3662a5036 SHA-256: b45ee48dd2788f618621cb4dd8981ab39f187ba17ebd858de90974fc6940efe8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, with numerous URLs pointing to external resources, some of which are hosted on compromised websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://lescourailleurs.com/upload/editor/file/63135787434.pdf
    • http://bettynblue.com/upload/fck_img/20210914/file/1898848599.pdf
    • http://ccsilver.kr/files/fckeditor/file/81553562161309b6ed2d01.pdf
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/jagewuvagukapadafasix.pdf
    • http://esejsc.com/upload/files/dawuzinapizes.pdf
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/pivavakaw.pdf
    • http://siamsnail.com/media/userfiles/files/2187410062.pdf
    • http://we2meeting.com/ckfinder/userfiles/publics/files/xapobuvuratebavotuz.pdf
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/josuxenifano.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141771e4c4bf---nuxolu.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a7e9ddda3---13805627451.pdf
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/virefar.pdf
    • http://kolbiko.com/images/uploads/file/21600453381.pdf
    • https://thehouseproduction.net/file/zaguwovuzojigidananefo.pdf
    • https://ymy-tea.tw/upload/files/64703420872.pdf
    • http://ewtch.com/upload/files/taposuvuvikofofax.pdf
    • https://akconta.com/uploads/files/18323768914.pdf
    • http://thaoduocvn.com/userfiles/image/file/97864974530.pdf
    • http://jedzenie365.pl/ckfinder/userfiles/files/11592186952.pdf
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/15716087733.pdf
    • http://tubietelbar.hu/uploadfile/32977845419.pdf
    • http://indyskischool.com/ckfinder/userfiles/files/31403204959.pdf
    • http://studiodara.eu/userfiles/files/20751391806.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161491939d4a73---90061949939.pdf
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/53776780034.pdf
    • http://dailycan.com/userfiles/files/nowenomelaxolefujesu.pdf
    • http://globalbizkorea.com/userData/board/file/6400744316.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=gta+sa+cleo+gold+apk+no+root+1.08+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B4 16792 bytes
font_01_sfnt_off000100c6.bin
a8a90e06dafa3e0fad4f46d997afac04cc4c52f5f793f7b1f5595439c7118d72
pdf-font-stream PDF embedded font (sfnt) at offset 0x100C6 18872 bytes
font_02_sfnt_off000131f4.bin
b03713620628cccb823d9a32f6f25fd8af0c34406796fd2ee03baa353348994c
pdf-font-stream PDF embedded font (sfnt) at offset 0x131F4 11260 bytes