Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd18196baff30844…

MALICIOUS

PDF

69.9 KB Created: 2021-09-26 21:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 78fab8817e19d9f36b9dc58fe281cd88 SHA-1: 098f469189c0444530810fa15d25d86f73231a64 SHA-256: bd18196baff3084496ee69966ccf18aa4634c000c69e2cfe0d31f7f9b71a03c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious files. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with numerous unknown URLs, supports this attack pattern. The ML classifier and ClamAV detection further indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://learnersdigest.org/userfiles/file/liwadozuxetavepepiweku.pdf In PDF document text
    • http://cautrucpalang.vn/webroot/img/files/94100064512.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16149c7c670230---jusevapoxawarebaga.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f89fbadeec---sosuwakoliladefojaxutur.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zobifivopigezewumigoputol.pdfIn PDF document text
    • http://yibetter.com/data/files/67210139407.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/71750324158.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/gawagitepa.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/xefiliribimiwavibanan.pdfIn PDF document text
    • http://synhbio.com/upload/files/79561962742.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/63126368348.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/98167331521.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/xukolipaparomasupin.pdfIn PDF document text
    • http://hoogbegaafdennu.nl/userfiles/file/porumo.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/dajofejefi.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/gatumiliditofatoxobaweba.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/zapuzajanosafomunavetuz.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/hlfpnkgkqedcslhmmu0nbgt7oi/lizosazidulonasep.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/rra37ecfsfaakg6gd174uh9qrf/16712140182.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/surumozusuvunenilipi.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/33004095673.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/fujero.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/27862278407.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/towig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=freedom+apk+hack+app+downloadPDF 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_off0000afbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBB 15964 bytes
SHA-256: b0ee35184242858856bada0687c9a1283da9a53da57b40978e638aeacc5049de
font_01_sfnt_off0000d82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF046 10576 bytes
SHA-256: 759b7a86178c8876ad81f1c6edd58da4093e4eccae492061eb2f5a46306fb617

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