Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c8482def0f3857c…

MALICIOUS

PDF

78.4 KB Created: 2021-09-18 12:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2ca9353bbeb77563fbd4f036bf981999 SHA-1: 031f8b6181584468725b7a65c89a3163ca57344e SHA-256: 2c8482def0f3857c4557e4dcb18324c2f2c852c4ceae11931dec00abbeacdfd3
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings supports the conclusion that the document is designed to host and distribute malicious links, likely as part of a phishing campaign or to lead users to malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/j1igamfjnes67li1ku2k6sh5gl/85995264235.pdf In PDF document text
    • https://burstallconrad.com/editor_files/file/69539955748.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210914124328096.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109140637048470.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/jilewogodosebimibuv.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/42376405173.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/movofet.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3ae80e703---98055458053.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/94828137990.pdfIn PDF document text
    • http://ipceurope.com/assets/file/vewereredoj.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/zegax.pdfIn PDF document text
    • https://dhesient.com/media/83077461413.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613178ecda77f---nutasusus.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/lakewidipodobifobuwik.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631852922.pdfIn PDF document text
    • http://stelmart.ru/userfiles/file/kinadadewatosolujavudeki.pdfIn PDF document text
    • http://na3.it/misc/file/75403094437.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/rizuwelatalediruvosu.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/31592763137.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/gukakukivitajuk.pdfIn PDF document text
    • http://teraval.cz/res/file/1197017328.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/soxurefizun.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210913051624.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/84662939846.pdfIn PDF document text
    • http://nprofit.hk/userfiles/31569329694.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/wajofidopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=prime+time+3+workbook+pdfPDF 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_off0000c782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC782 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF99 10672 bytes
SHA-256: 1104efe04672052fe1be56420b5d40290f31a1e555ee46f1ebf29c47a831a612
font_02_sfnt_off0000f7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EB 19816 bytes
SHA-256: f0fe27e331f70faa24989f7fc39df85428351de73d140e03f7b09c22f7299261

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