Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb0574d370c2398…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 02:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 54531eebcebbf8dfa3ad7e54bebb223e SHA-1: d9dd38c78569a315d8b351f92f590245a9cfcd3a SHA-256: 5bb0574d370c2398adade0e6dd5e026bb5ca3367be1b0c835ecbaa99df55c5c8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://hatdesechia.com/storage/ckfinder/files/85426998139.pdf In PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/budefadigenidoxokodo.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb7af13447---dikugezajulaxerunanenud.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/bazof.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/kupiveg.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/39e0ecc5c7b9d3f907f2d968d6ec735e/59271446752.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/minedoxasu.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/wojegajelosunitoda.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/38484614215.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/lonijirefoba.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/77126341241.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/07/file/20210907_070948_108.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/10226537135.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/dodupitukanelabaf.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/63898872367.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/repogobevagoju.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/tuvezalekufipoj.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/2mm8orkjl0f749gtlufmv2q1g5/dexexasesarodobiviso.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/xipivubalaruwov.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/xedejumewegegufazekamokub.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/83435723524.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/67192915192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=roblox+robux+lucky+patcherPDF 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_off0000d865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD865 10700 bytes
SHA-256: 6b5b760a7b8dbc46d60703d68818d6d3d22260b9c14dfb3f5a2e4a308151821f
font_01_sfnt_off0000f100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF100 19768 bytes
SHA-256: 0b4843006bcb2aec61859639d2f8a9e7051ef957da55cafbb76ddf0aede650be
font_02_sfnt_off000124d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1