Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b89fbc16e936b9…

MALICIOUS

PDF

72.6 KB Created: 2021-09-16 13:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cf0c4ebf1ccda431014d75d26dd6ce7a SHA-1: fe89e13cd7ecaa4588b68260f9648ee3a6619e55 SHA-256: 93b89fbc16e936b9befe2848a22e968d2a24301cd50562ca12bf010564c1d9b5
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to various domains, including compromised CMS uploads and potentially disposable hosting. The primary purpose appears to be directing users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://belv.ru/userfiles/file/sojojoxiwipawexefolenoju.pdf In PDF document text
    • http://soleilboo.com/images/uploads/files/fujobujawu.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/78955822940.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/85314603866.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/10557720879.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/miwijazofenezipazibiv.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343254383f5---wumemakabem.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/42463894645.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/g70ircd3bjv36093rcqduqv8uc/vutuzapezej.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/jigefikizugafukudi.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/tomifom.pdfIn PDF document text
    • http://pasted-radio.de/web/files/kekosuwojevoxoxolipege.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/26918959315.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/83064253326.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210902_ACFEB5AC49FB011E.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/kixavo.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/43111224719.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210911180118_654470528.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/puxatawinekadidowotud.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/91235962471.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/13671862835.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614149c7a9a6c---77977652794.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/68583439685.pdfIn PDF document text
    • http://synphabase.ch/upload/file/raxujevojepadu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=negative+keyword+generatorPDF 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_off0000bd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD597 10544 bytes
SHA-256: c456a38dedcd753a10984df538c29086f6f49990bc516f995cdec412a8de63dc
font_02_sfnt_off0000ed97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED97 15516 bytes
SHA-256: 0de7c007d119c47ebf44fbb9ae4a16a1f922f7fdd536e8389fff879be7c82d11

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