Malicious PDF — malware analysis report

Static analysis result for SHA-256 19300b5685a7e756…

MALICIOUS

PDF

75.2 KB Created: 2021-09-15 10:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 51ad0780fec19088b3b4cb62ffef31da SHA-1: c0f8145af2db6079b9d74f4150a3e03d64732e6d SHA-256: 19300b5685a7e756bac1dd33dbea9e5a86a0ce31c4e9b9c36e0fba7a93ce79a8
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites acting as a link farm. The presence of JavaScript suggests an attempt to execute malicious code, likely to redirect the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://grafichesirio.com/userfiles/files/16068161491.pdf In PDF document text
    • http://srmtteaparty.com/uploads/files/202109102203196138.pdfIn PDF document text
    • https://fratellifurloni.it/file/fixubabenijijunuvej.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/d32453988d7170a966f939b1a1dd5093/zolexafot.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/luwumebetafujibizokede.pdfIn PDF document text
    • http://skupka23.ru/upload/m/risonelesevozeriwapo.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/82019208106.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/80616729651.pdfIn PDF document text
    • http://agama-rc.com/upload/files/64469177652.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c8d9c6ce9---fumax.pdfIn PDF document text
    • http://anindecor.pl/files/file/55354127515.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/pekiki.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/80999233889.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/59001552739.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/36705744158.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/54755422093.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/34444081515.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/dojoviliweramagifanel.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/70141469750.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/37854140618.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/75796014351.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/nbqfubuu1eahm033j76ek91bdi/fadomazopewiko.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/48065767228.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/29009848188.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/86947338946.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16134618dc0c91---sawakazemota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=kumkum+bhagya+desi+serials+onlinePDF 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_off0000c125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC125 11032 bytes
SHA-256: 92e9b6e62069d26b250787b0518a5c0e60f8ce78d2fbd2b1e5856e13bce3b6e7
font_01_sfnt_off0000da63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF275 17316 bytes
SHA-256: 4e570b2a3c27a5b968f85c4e05d6f7bce237158d0b2e97a6977ca13e3578ef86

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