Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ca65fd3ecc0f192…

MALICIOUS

PDF

85.9 KB Created: 2021-09-13 00:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7a8da90c8015f9b6410fedaedfeb0d9f SHA-1: de850250886779342e24eaa81dd348371e7bb4f2 SHA-256: 8ca65fd3ecc0f19212bfde0b7c7842fb101e259d33df53172faf193f83f4d7ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and the ML classifier assigned a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The presence of embedded URLs and the nature of the link farm suggest an attempt to distribute malicious content or phish for information.

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://sportingclubalbinia.eu/userfiles/files/77382719391.pdf In PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/96464548300.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/66094908485.pdfIn PDF document text
    • http://huntland.hu/upload/file/famez.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf4b833c3d---vonezor.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/peruxofudox.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/zapezevefuvujutim.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a86e86f87c---xabarutiwilizimonelis.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/bizirigiwenurama.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/kepamezijen.pdfIn PDF document text
    • http://wdnederland.nl/file/wijidegivuzesaz.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613b629a0f4c9---riwawupibog.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/89973400329.pdfIn PDF document text
    • https://netpage.info/userfiles/file/mefibegefunum.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139f50791ee6---56301416325.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/pekuwupaxizuzu.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/josovopazit.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/gopunupokekuzufu.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/crulcc3sd1rr8demiufqbrtire/91544517405.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210913052353469418.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/vabumodugizexi.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/bodepori.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161384f9c92975---25208004149.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202196141632.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=i+get+pop+ups+on+my+android+phonePDF 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_off0000e9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F6 10960 bytes
SHA-256: c94c3934f842a547097e9d8b66dae4f4bbb6d0c188c255b971df59b2520b346f
font_02_sfnt_off00011afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFA 18268 bytes
SHA-256: 4a3091e1cd3f16bbb36a5cf69b45a55ac80b541c9d8006bbb4b4e97fa498d800

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