Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d250131e36b075…

MALICIOUS

PDF

82.3 KB Created: 2021-08-24 17:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a594dede5fe43af135aa084f8cc00ff3 SHA-1: 8db3d49a28aac3615a8c101b1fd84bac8d581369 SHA-256: 45d250131e36b07507445182f1317dc76e3c3db9839dc7d14d329c1ced0bcfba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://synerhu.ru/uplcv?utm_term=software+to+convert+pdf+to+doc PDF link annotation
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a22c8fd5d---linig.pdfIn PDF document text
    • http://ildong.org/sa_upload/userfiles/file/20210723063820.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/podimitusuvajosigidog.pdfIn PDF document text
    • http://washburnhs64.com/clients/f/f7/f75dc469904bb25755ea64d7551c4a95/File/ferojexi.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/42971739145.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/bepowedinalasatetefav.pdfIn PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/89009069163.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/razazakawitizu.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/e9b375963b5cc77e83e03ce43b505617/69853322103.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1628925062_1.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/37820757136.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/11345845043.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/zejolegemazeneniwadipanu.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/47589033203.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/63293297203.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/19777911138.pdfIn PDF document text
    • https://jotelek.hu/files/file/vigokuvabowoxijez.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/29380745370.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/3e1753cd236fb8b07192b6b16eaa5466/82363449345.pdfIn PDF document text
    • http://dnepropress.net/files/file/panazulozipafipixoj.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cb0a04fc3---berenekakifoxaz.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/487751314c0fef665da9903d92a4776a/pumobi.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/doxased.pdfIn PDF document text
    • https://whitesal.com/data/images/file/1572_20210520081416.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b844cede7b3---94133975744.pdfIn PDF document text
    • 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_off0000def6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF6 10532 bytes
SHA-256: 018da60980ea451f0e2b2424873805cb5d48423b66f3f97efaf3428de80276b1
font_01_sfnt_off0000f72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F40 16596 bytes
SHA-256: b15bd32e2530ea7e1fed00157b85e13f2c4a02eea197e29d8981573ffbdab13e