Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1423713854c00b…

MALICIOUS

PDF

82.8 KB Created: 2021-09-17 08:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 28fa2ec99d5934af2f159f56fa1de02c SHA-1: 60e090e9e49bf981d18cfa549f55ea458b2641b0 SHA-256: bc1423713854c00bec5d240901b3cba41ac8c55052acd48ed9be2720f2f72294
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on compromised websites or disposable domains, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead the user to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sananselmo.com/wysiwygfiles/file/38891547812.pdf In PDF document text
    • http://lidaoxc.com/upload/files/32179613954.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/84173361218.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139659db6db1---68209280529.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc8e9026b9---jibodebiguruf.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/14285293808.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/pipazew.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/dozewuzebe.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/37627126222.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/sukefiforafujabopux.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/misevukefopuvedudobu.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/zitezesuretexowagori.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/m9flgnn2g56kj61pr4otg4cr69/xewoxomo.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff212555db---tatipeluxikagupekisupuda.pdfIn PDF document text
    • https://norservis.cz/files/files/38224822917.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/1975316668.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/kigojobabezogemuxeze.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/13812250557.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/86760805506.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/13036922941.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/161370e70839f6---46849713617.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/7309651437.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/lokosabikagazajowegifedij.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/42951382978.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/4711636818.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/bodawuvowodatutogikamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=where+can+i+watch+indiana+jonesPDF 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_off0000deef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEF 10632 bytes
SHA-256: 767f90c6ffa08b21c26427281a2553c7f9205a7f37aa9a324c11517cda47d7b1
font_01_sfnt_off0000f743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF743 17868 bytes
SHA-256: 1592e2931341469965deda9502266dbed2c43d4c49afe879d337f6a01e66bb93
font_02_sfnt_off0001252b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1