Malicious PDF — malware analysis report

Static analysis result for SHA-256 24a14e0af517c2b8…

MALICIOUS

PDF

86.8 KB Created: 2021-09-15 15:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 70882c212b0740e27aba6fb2750535c8 SHA-1: 635cee9eb9448edc316865800d79d0819eb5a814 SHA-256: 24a14e0af517c2b804910607a3eea7b383e78a2edc8c3f5f013be5f1afac0694
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://medvor.ru/uplcv?utm_term=how+to+use+android+phone+as+writing+pad+for+pc PDF link annotation
    • http://arcadia-fitness.es/userfiles/file/tazapirobujer.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/gomej.pdfIn PDF document text
    • http://superazs.ru/images/news/file/zomuxenate.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/mutixawukusatisitisabuxo.pdfIn PDF document text
    • http://www.polni.si/Images/files/89750513948.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/tumawalazonesitixiw.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/wanefuxoraderujajiraz.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/lafupad.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/vodafewutuzanebaremewo.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/8060331215.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/mitasevopopaxonax.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/49717904576.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/as91ogh656v458oem20bic6pp6/tejamesojenoxokix.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/pisebofav.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/dokavivesosebibalovi.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/peredezojot.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/kovomovirunona.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/gebugalodepiwa.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/7pas6o5l4bighgvvjvsuhr8nl0/mafotitufi.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/kopevixilofunaj.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210903100122.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/samoduzigezopotijeru.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/38780595400.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/72893948275.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/jadirufukevojag.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6ce2d03b4---migakozaxuwexawonafiw.pdfIn PDF document text
    • 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_off0000eccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E6 11028 bytes
SHA-256: 93ff9e072593ed9d8313fac8ddb3e4e84f4dd228d9b0d75e959edc2eb9011717
font_02_sfnt_off00011e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E55 17956 bytes
SHA-256: d9be5e4e84d8c4de6f0a58d8129c8b2634ad30c1f7b7ef92c43e48a3b88d09cc

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