Malicious PDF — malware analysis report

Static analysis result for SHA-256 d29964382cc40d39…

MALICIOUS

PDF

68.7 KB Created: 2021-09-17 23:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 02bcaa5fc9f5b7f3cd12eef28148bbe2 SHA-1: 8e390c10064bb21daf0245e554dde1bfadef342d SHA-256: d29964382cc40d39f8d16e4a5edc38a27d86e058eba569bc819da747dbf1127d
156 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs that are part of a link farm, directing users to external sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing trojan. The presence of numerous links on potentially compromised or disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://agierresrl.it/userfiles/files/70650621798.pdf In PDF document text
    • http://vce34.ru/attachments/file/domikuxuzatobasebulepiwum.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/9600247612.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/18011178126.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/71437839051.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/pumavufazuzataduroworiro.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/juwuzegow.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/vasolejope.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/80309348497.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/bulapanokuxifijos.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/kutudadanilematugif.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/43116866733.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/24264381964.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/56b03ee27b5f4359d94895bb88cea274/75515103339.pdfIn PDF document text
    • http://12shio5.com/contents/files/suvodad.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/dusakulomalununuwekofan.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-7/20210907015538906785.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/12870442063.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/52571082408.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/c8c672875c5145c7f4aa2b31d182b667/42770949284.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613311cc42122---budisokudakikuf.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/43848923830.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/lapak.pdfIn PDF document text
    • https://miet.hu/kepek/mitisivo.pdfIn PDF document text
    • http://totoumi.jp/upload/file/pupelenovamufuzoxumumakiv.pdfIn PDF document text
    • http://idroter.org/userfiles/files/wosovapukonofolul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=androrat+apk+download+2019+for+androidPDF 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_off0000b111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB111 14204 bytes
SHA-256: 65bc6232dff8b8b7b4c6609ebc1cd2968d02e46e7e58b02a4d0848a47c2c7d5e
font_01_sfnt_off0000d42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC44 10812 bytes
SHA-256: c92ed1b37c8e729529dc39a5e753c1636ccbb2624a29923e9b5ec879188aa6d8

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