Malicious PDF — malware analysis report

Static analysis result for SHA-256 badb0d083535c45b…

MALICIOUS

PDF

81.9 KB Created: 2021-08-16 04:38:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b26d8789a60154b16de85926e1740906 SHA-1: eac2f46afcc185b730a9440ffc727a8f7d13bf25 SHA-256: badb0d083535c45bc4b7f8f078e245a6737eecd2c003783ffcdfa797ed5d87a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to other PDF files hosted on various websites, many of which appear to be compromised. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to distribute malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of the file. While no scripts were explicitly extracted, the structure and URL patterns are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c66d7d558---40717134422.pdf In PDF document text
    • https://suprizpin.com/calisma2/files/uploads/39798718513.pdfIn PDF document text
    • http://webatnet.de/ckfinder/userfiles/files/bazabe.pdfIn PDF document text
    • https://mfdesign.hu/files/file/23938491674.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/q1slsustb2q011q6ckjmk5igcq/86577627644.pdfIn PDF document text
    • http://iworking.vn/uploads/files/79627786155.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/pojuxunalijekopef.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/kefimu.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/felibemilibeginatevubebo.pdfIn PDF document text
    • http://usmleworkout.com/files/file/15150403352.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/d08f90d9c93a675c5c297c53895b92ce/8760151161.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/fikadapijisufedeju.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/govutedeb.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/kodapav.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/21242477032.pdfIn PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/koxedozewetu.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/woboni.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/b9a4c4687e7f55752f45417a7f3de447/23409246107.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d202c67624---33572142804.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/durefivozowixideperakaru.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/28778752920.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/8651434008.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5ef752161---widimimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=archero+mod+apk+ios+no+jailbreakPDF 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_off0000dab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB6 17640 bytes
SHA-256: 3abb8cc3bf7c9761f84a2c8eebf969d04a04056481e1f5bdd57aa355c5fbec66
font_01_sfnt_off0001088f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088F 11024 bytes
SHA-256: 428a840e08abc17b74a034c234e2940afab8ad44da0dcb1218c065a48a31fecd
font_02_sfnt_off000121b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.