Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd727a7a148064ef…

MALICIOUS

PDF

79.8 KB Created: 2021-09-18 10:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e48f7ca2e8e54f304d4c8f5d550d153 SHA-1: 4c8487be1e5a691093b88924cda29b5175d63ce8 SHA-256: fd727a7a148064ef7204348e620b484c56bc2b09aad10f5c2140fdebbc8e282e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to other PDF files hosted on various domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farms on disposable hosting supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://chcial.ru/uplcv?utm_term=specimen+zero+apk+ios
    • http://landpas.pl/upload/file/xebawosuzikige.pdf
    • https://mytopics.it/uploads/file/23233646125.pdf
    • https://zevkotodoseme.com/upload/ckfinder/files/88461668021.pdf
    • http://abwingsjanaf.com/uploads/files/65130984074.pdf
    • http://jngf.cn/files/file/91476792401.pdf
    • https://rajnnuhiddje.se/userfiles/file/pepifotosefufarof.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe2e54e47d---89550848033.pdf
    • http://rund.cz/UserFiles/File/37456558018.pdf
    • https://ideylia.fr/uploads/file/fixed.pdf
    • http://glavis.biz/userfiles/file/2555252122.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/3a4affh2hnhlu1bjmgn4otect5/4838525568.pdf
    • http://ipsgroupjjn.org/userfiles/file/23739575684.pdf
    • http://goldmustang.com/files/files/56931437919.pdf
    • http://chistogood.ru/admin/ckfinder/userfiles/files/83219516876.pdf
    • https://beautydiction.com/ckfinder/userfiles/files/84783498273.pdf
    • http://pjteam.hu/uploads/16930299740.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/89d0d9b70c1ff46d0a16dbae2adad782/17414415386.pdf
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/6296948905.pdf
    • https://elsa-daulte.com/ckfinder/userfiles/files/pukosomer.pdf
    • https://clinicscrm.com/img/files/84984031386.pdf
    • http://www.tokyomagic.jp/images/library/File/sakujakanuwoku.pdf
    • http://aviatechinform.ru/sadm_files/gelaxoxajuxovemufepik.pdf
    • https://bisleri.genefied.co/ckfinder/userfiles/files/190009377.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AC 16792 bytes
font_01_sfnt_off0000e8c3.bin
6326c498dbbfdbb1fc6f32d32b76a9b607916a3b28915ca1c6250ad1faa6cff6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C3 10616 bytes
font_02_sfnt_off00010100.bin
af591c79186016e9e6a32203e7ea248295e1f7a633d5d7b828b6208624bc3541		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10100 18844 bytes

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