Malicious PDF — malware analysis report

Static analysis result for SHA-256 d80c65b7c03097b6…

MALICIOUS

PDF

93.5 KB Created: 2021-09-03 15:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1d3c152bdc674c66bf98e5a5578d44ea SHA-1: edb4fe7b9e9f7ce1518e0a5a9eec33717cff537c SHA-256: d80c65b7c03097b64f9f4461c6eb5937fd422d5ee5f55b87a26e5b57d349708a
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 ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised hosting or disposable domains. The primary intent appears to be redirecting users to malicious content, leveraging the PDF as a deceptive wrapper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://atputasbazes.lv/images/userfiles/files/lofawobuke.pdf In PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/bilebelajidizaburijoxo.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/97023137322.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/jokujuzobutenejavozo.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161291c0b32fe6---tuzolibewudabidexikawed.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/55603818948.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/af096c1049da54bc4a35eba6e4c96334/36329100872.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/nutifisa.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/85432532053.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/e9p90t0st0jpbphf5s1qjpfeo0/netixovefoxokewelog.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/81096671989.pdfIn PDF document text
    • http://irths.com/upload_files/files/58907494456.pdfIn PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/bivixadivoximemak.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/07/files/210713193854.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/15973244994.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/nakekogarinatexeliku.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/43676370176.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610ee5bbe2d02---46880337424.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/29e7cdb453071a233f45390adf0d9a33/61122906215.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/975524499.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16076289881c40---fusawolitidufux.pdfIn PDF document text
    • http://4bx.pl/public/file/33734640264.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/60504934477.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/voreni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=rosatellum+spiegazione+pdfPDF 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_off0001080a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12021 10948 bytes
SHA-256: 4b81258e9288d58b9996f20037bac23240437b6f075e569324b3634cd0b697f8
font_02_sfnt_off00013950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13950 17872 bytes
SHA-256: 00f5a0bcfc236eead2131ffadf7fc5b5cba89a60b094a0a690c07f109b296930

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