Malicious PDF — malware analysis report

Static analysis result for SHA-256 570b58edb6842c31…

MALICIOUS

PDF

72.2 KB Created: 2021-09-01 00:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 155e58e7daccc1357b02d01e1cbce73c SHA-1: 93dd8233e544a8c9ced080908ff2abed8e5d2364 SHA-256: 570b58edb6842c3193a6e01937012f5f4d97d28307d8cdb9c6c50f2bd293688b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://queure.ru/uplcv?utm_term=where+in+the+cell+does+glycolysis+take+place PDF link annotation
    • http://dyglas.com/userData/board/file/88856617350.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/vhp400bdvbnurmks9smndoa0ei/71002810769.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/80532633681.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/nipebegaze.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/8tjnjrfr3ll7g74cnbe1g5r1ed/kuboke.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/011618486748.pdfIn PDF document text
    • https://gilbertems.com/videos/file/nikofikakenewesilavijotal.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/77415247009.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/6152560398.pdfIn PDF document text
    • https://csn-alliance.com/data/files/zilokukitesunikelez.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c555006be7b---wegolulapokepo.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/93297401852.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/84763092626.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/13911857299.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/59437915209.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/25358099239.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/6680981389.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/nurijid.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/030748256454.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/68889546759.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160826990dccc5---lewikatitegamitob.pdfIn PDF document text
    • 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_off0000b90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB90D 15784 bytes
SHA-256: 59593570358f383b9e7ef761f2ad24cc5870c6e538899ce39bad1124710a7aae
font_01_sfnt_off0000e0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BE 10992 bytes
SHA-256: c98bc87cd84021e209f9295385282cf3072a9ca6fa23a515f698153b076f7aa3
font_02_sfnt_off0000fa12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1