Malicious PDF — malware analysis report

Static analysis result for SHA-256 1864fcec4aa5399b…

MALICIOUS

PDF

106.4 KB Created: 2021-08-08 10:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 8faa470f6d850c93ed058b01724954c5 SHA-1: 8f24968cf9da72ebd05a9e9dfcc71bdea0fbc0e8 SHA-256: 1864fcec4aa5399b817196a6f388b67f657ae6eceae1e6973e72b3618bb24b4b
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tragadsonisurat.com/ckfinder/userfiles/files/kumuvuwowogisex.pdf In PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/tupinuwiwufukitipasilaziz.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2a060fe96---keresimakojesedudulur.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7013699a7---wanalef.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/10571359519.pdfIn PDF document text
    • http://cycling-software.com/files/file/wawozuvujege.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/zaxekidaselasokumopar.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/72402513572.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/vibupovawuniwuwafadukuzem.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/365029957.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746eb541a1e---41865241427.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/dakelawo.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/30125251283.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/nulatinidi.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05ecb19061---tomodofikizuvododivofimu.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a84bbf328dbccda8e5da446cb270a3a1/direwijimugetafokilenagid.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/o79t7aeo8v2eu9a330u95uarr2/kezakitix.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/vawitexosefam.pdfIn PDF document text
    • https://lesura.net/userfiles/file/samidu.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/lafipifukerugitejifes.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/574a5d6c4cac85f385c8d60aa74a0810/sajev.pdfIn PDF document text
    • http://kiemtoanhaiphong.vn/upload/files/53721379375.pdfIn PDF document text
    • https://actor-conseil.com/files/file/61368887778.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/34392441395.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609831bdbd2f6---6245626021.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=xbox+360+emulator+for+iphone+cydiaPDF 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_off00012c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3E 22520 bytes
SHA-256: 337b9e853304b2f559f1df838228c569fa8ec0bad30b64fb002a7674764bbea4
font_01_sfnt_off0001672b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1672B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F42 11644 bytes
SHA-256: 9e79e5e79038872e13133e3e834a6413a3081651eddb7cd35ef720121b920caf