Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f5f627b6028c3f1…

MALICIOUS

PDF

75.4 KB Created: 2021-08-21 12:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 21605c0e5d592f5e4d24d28ee840f83e SHA-1: 1ae8d4bbc607a7336985fbab75409ca25bca1d10 SHA-256: 6f5f627b6028c3f121ed83145f8b49055a4c170fe6c098deae7cbc967e42d4dd
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an effort to obscure the ultimate destination. The presence of multiple external URIs and a link farm heuristic strongly indicates the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://drrajanmahtani.com/userfiles/files/puzuwupome.pdf In PDF document text
    • https://greenlandpark.com/uploads/files/90396300530.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609698289d9bb---najidumozosifipotomu.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/wobigepekemegulami.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608770299fc56---44422549683.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c29c8768b6c---17776380865.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/tigelad.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/a85g14l4b87m1sq3192lut1umq/13581393643.pdfIn PDF document text
    • http://someteme.com/archivos/_20210710045506.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/17580b023ded916150b4207e71ae10de/naxutidunusokasunufujud.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/92913402652.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/f06c1b42565ceb04a85f413bf496b342/69685932717.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/79305419079.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/35474459257.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/42043486900.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/79776701291.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/81a6b674a0adde633934b928012bfa28/metenotivizapuvovowu.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-16/20210516114612935786.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/xamonag.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a5596fe01---69853177673.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-7/20210507021757412320.pdfIn PDF document text
    • http://termocity.by/pics/files/widimig.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/fupelefow.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/zoruludibemokodelegazin.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/tukaxurinabuwowet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=download+minecraft+pc+versi+terbaru+2020+gratisPDF 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_off0000c334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC334 15676 bytes
SHA-256: fb3123ea40ac631fd354fdff3fddcad2ed6b01c6a3afeb2c2488b9aa0554b767
font_01_sfnt_off0000eb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10393 11600 bytes
SHA-256: 13635b35bb2003f0dece0a42b79ddc76ec0a1a291defcef88471b71f12d23343