Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83e3e0833f2e65c…

MALICIOUS

PDF

82.7 KB Created: 2021-08-21 16:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 55733714a51dec2900e11060cab79ee1 SHA-1: 56e681ae64acf040ea9454127c85d70db3323b74 SHA-256: c83e3e0833f2e65ce796f9baa380dd3056ecaa43c7bcab6b8196c87a6880aaa1
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://paklya.su/design/img/upload/file/90851408302.pdf In PDF document text
    • http://robwalker.net/fckupload/file/dosix.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/ziniwudaroben.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/nq7vfpkkklg1nacoq74d9h0kiu/domenopasaniwovudor.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16097f4e65e4cb---jazipifenonobefij.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/7094116071.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210710_142116.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/xekosozopuwagojasev.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/52907225985.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bed55ff83---tapowefetixo.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/sosojedugazajiduxafuxite.pdfIn PDF document text
    • https://dineflon.com//files/88367615396.pdfIn PDF document text
    • https://avenue102.com/uploads/file/zevezi.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78066df837---bolatexuwetosat.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/17974472928.pdfIn PDF document text
    • https://angkagenap.com/contents//files/76216809965.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/gapavavujeka.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/14849472413.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/05b6f75a799c9f22448c06dd7b0da529/jibekag.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/81426167001.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/38559882652.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/dhndr3ilnuh21kui7lk6459at7/bajeritibopabuw.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/90681636966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+reset+your+voicemail+pin+on+iphonePDF 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_off0000dea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA5 16856 bytes
SHA-256: 5b24ff065575f80f2aba7c85da630478f1ca34f0d98d795c1b81b73e8cced9c2
font_01_sfnt_off00010aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA7 10996 bytes
SHA-256: b277c93d84ca422e37ba70b964e433738756c307650d8b19e9c565270ac89677
font_02_sfnt_off00012412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12412 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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