Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d8ee01b155c929…

MALICIOUS

PDF

82.5 KB Created: 2021-09-24 01:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2e894accb878ac580159e8206f6c7a8f SHA-1: a0cffb22b13eda2dab6baf76bdba489dcfc19415 SHA-256: c6d8ee01b155c929029662db8b8e71c3defb36f37b0d607577d49521d25ff370
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many of which point to compromised WordPress uploads or disposable hosting, forming a link farm. An embedded JavaScript stream was also detected, suggesting potential for further malicious actions like payload delivery or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://paperland.bg/uploads/file/zojozubokesobikosirow.pdf In PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9d04ae09e---ridixu.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/vr12pjhs4epjs0fal6dqd4g35s/jivamaxafag.pdfIn PDF document text
    • http://derechosenred.org/aym_image/files/36865054427.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/zuvela.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/9758680832.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/tukitufuwuzebop.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/vazekiziwebagum.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/fuvujulinava.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/jujaluralepisetoxopajob.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/70335963750.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/lavilopixolosiforumeret.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/10783047893.pdfIn PDF document text
    • http://byecook.com/ckupload/files/vagutesure.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/fozaveliwom.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/87784195066.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/44288704736.pdfIn PDF document text
    • https://slide-bearing.com/d/files/zijeror.pdfIn PDF document text
    • http://sudeoksa.net/userfiles/file/20210911120816.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/a256773213b02050d56604c53d8d82b9/57623830519.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/60116626955.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/20401694157.pdfIn PDF document text
    • https://bem-sa.com/img/file/90974188560.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/54854207266.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/62864958939.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=lav+din+egen+ringetone+til+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_off0000e201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE201 10280 bytes
SHA-256: e832eff34a56714c68c7d3eaf997008d90cd24eed4cd7d6cecc606d2d84c2e36
font_01_sfnt_off0000f8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F8 16896 bytes
SHA-256: c995402ce66d55cf1a0f0ff850bd3bb57ed5b549b4070c6b053898b2acda666d
font_02_sfnt_off00012499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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