Malicious PDF — malware analysis report

Static analysis result for SHA-256 d75dbf71801672ba…

MALICIOUS

PDF

70.8 KB Created: 2021-09-24 13:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: befb78689450e0ff297d980744c8ef65 SHA-1: 1b1859e5e3a81b3bcfba94752558ed4d14add98f SHA-256: d75dbf71801672ba5f176dd04a720540cd97785bf0233ca0ad1edb0ff073fe36
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

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://laborke.ru/uplcv?utm_term=android+app+with+react+native PDF link annotation
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/nokixupotejof.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16133de73b65ab---1674387946.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021091521050742.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/99555786933.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/24234502059.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/ximixiwomabepu.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/xutaxoremudewebo.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/zizelusibonusu.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/70544316070.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/33256659725.pdfIn PDF document text
    • http://cataga.de/beta/files/file/86465398794.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-11/20210911093357860875.pdfIn PDF document text
    • http://tzsunup.com/upload/84951429271.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/39767296079.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/vitidijemite.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613eeb298c77b---80090634321.pdfIn PDF document text
    • http://momsystem.ru/public/file/wegarimukikipavafa.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/55f6b61e1ff9be457bd2503c411efbe5/gotekagasap.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/jeroselo.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/21127392541.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/pitukitapune.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/80093366780.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_off0000b166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB166 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97D 10532 bytes
SHA-256: d3efdb9c52239614b57fe245c66d386d8776bcf0e4520ec986f0f70296ae457d
font_02_sfnt_off0000e16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16F 17276 bytes
SHA-256: b3db8eaa93fa2e4cb0a78535b2818211141193a979dc373e1165dd4f8e7d47c3