Malicious PDF — malware analysis report

Static analysis result for SHA-256 803ebbf8e705a479…

MALICIOUS

PDF

76.7 KB Created: 2021-09-14 11:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4bb3ea39fe33189e6b64718fc8c20262 SHA-1: c0fbd515aea230fef0ece49eb5b3d1602eeb49c2 SHA-256: 803ebbf8e705a47958c6eac3e92dff682d5edc2387801b1ce4cccc8a8c71647c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://drnanemilk.com/tctt/sites/aaa/file/goxiso.pdf In PDF document text
    • http://boathousebrokerage.com/userfiles/file/3921034617.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/0b3e99934871b191e24a4b79dda8f20a/30201579061.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/luwepubirekefatulawabexi.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/matoturo.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/webomavuxomalomewemazig.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/julefidabopi.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/93192150305.pdfIn PDF document text
    • https://netlandschool.cl/files/kudorigakivetibefexudoro.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/2f09a5122f6b7cca3c5a7a2529ed1b42/97928861338.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/lp2v41dpdieemqv0pfa7c6hqrl/rijedunevapibares.pdfIn PDF document text
    • https://pcetravel.com/files/file/82656716734.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/dizawuruvaxunim.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/fizuwizepuzo.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/vademojawiraneg.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/firupotedazoz.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/werisomupeju.pdfIn PDF document text
    • http://lagrupacio.cat/file/49407069742.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9b9f62367---darowumojodasosevesife.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/30714155433.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210907073602.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/4962965184.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/joneteloduwuf.pdfIn PDF document text
    • http://vanhacollection.com/images/files/kikarebirokupil.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/910828300.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/82315299430.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/vizevimoweva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=voloco+apk+downloadPDF 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_off0000c376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC376 19540 bytes
SHA-256: c83692cb0bff14b6df48914593b30e367407cb70a2ac20cb56febc321db64a58
font_01_sfnt_off0000f68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA4 10064 bytes
SHA-256: 18093282aa0aae4727dfae977827890b828ef79ac4327f34800c56be55312451