Malicious PDF — malware analysis report

Static analysis result for SHA-256 650a4c84ced91007…

MALICIOUS

PDF

69.6 KB Created: 2021-09-13 06:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0ef86ef2cbd29ef0a02c54c69a743bfb SHA-1: c56e25e15aa83496f137e4fad388cfaf19696752 SHA-256: 650a4c84ced910077454141b5499779ad7c69a54fcfcf51a0fa2a55d1c3efa2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to numerous other PDF files hosted on various domains, with some links pointing to compromised CMS upload storage. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://hophamthaibinh.com/upload/files/85508912790.pdf In PDF document text
    • http://veraschwemmle.de/fckdata/file/wowigupebabelekiniponifo.pdfIn PDF document text
    • http://zaiger.ru/img/file/rodajapu.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/jojogepudoxoravoge.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/81633056012.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/wijuwijepoz.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109081429136011.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/26752711789.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/norozulelujezufexoga.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/ritapu.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/guwusirexejudefilijomiva.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/witipejupogonoguxor.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/kubivivijeviji.pdfIn PDF document text
    • http://attlas.center/userfiles/file/67766000892.pdfIn PDF document text
    • https://riwg.in/userfiles/file/39635744445.pdfIn PDF document text
    • https://posh.hr/files/fonexorixagidebaridoxapin.pdfIn PDF document text
    • http://geoman.cz/data/file/20440496045.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/1e6a6d583f13f5f1a3812ee541cd6c2d/fexesek.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/76375532497.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/63413588198.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/regogevuvidade.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/a7bf2e8b04e235289f5294a58fe0cd7f/lunuvuku.pdfIn PDF document text
    • http://kahsport.cz/userfiles/file/nadug.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7869cf675---16704658704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=paragon+exfat+ntfs+%26+hfs%2B+apkPDF 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_off0000b318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB318 10352 bytes
SHA-256: 6b8682dc3c0d0e6204f445bf87b8b70b487d6f033cc63fb6fc027f4b93b4d17c
font_01_sfnt_off0000caaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C1 14960 bytes
SHA-256: 3af09be5723612fe46b42ffd1e7cd583c788f67db7ab55a8e1dcf0d6edae0328