Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1183c0d33e2a596…

MALICIOUS

PDF

85.7 KB Created: 2021-09-17 17:34:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fe733396d05a112d0b8b3eda8e7a8657 SHA-1: 792cec4ea96f40b55cfe74b7819217331ffd2be4 SHA-256: b1183c0d33e2a596c6a5f0e285fe171c4f8314b335115ec79b37a5c1839a424c
176 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links pointing to potentially compromised websites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document's structure and embedded links align with techniques used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://coretry.ru/uplcv?utm_term=best+text+scanner+for+android PDF link annotation
    • http://hyunsin.net/userfiles/file/57905822118.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136037387795---xoweredusijijuf.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/39127616018.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/fedapimanavami.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/10594054536.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/32918979076.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/8293523954.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/62667111851.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d0df733b7---79373987008.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/farisow.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/48187991543.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/repananon.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/44333912778.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/zuwukigivoda.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/610116bb33dca10d8701f92271cbce90/56646868798.pdfIn PDF document text
    • http://edituj.cz/res/file/fimogarujoxukupetu.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/53976614090.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/75538835836.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/nedaroked.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/68096164486.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/40911873932.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/vivageg.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210913_061810.pdfIn PDF document text
    • http://chenruichem.com/upload/files/91567242074.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/gejubev.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_off0000ec37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC37 17268 bytes
SHA-256: 7cf84721fac10fb8f4612818c936ca38835c12e056a2cd506119a552b1e115e3
font_01_sfnt_off000118b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130CC 10576 bytes
SHA-256: 4a696108c5a41c551c527ee1f3fb6103e2eb62192c7bf9ca9182c61df4e56c1f

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