Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad527b8aa351653…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 13:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d66870b9a22c18a473c0a5caba5b5062 SHA-1: 3830b10d55c5997c2a08dec7885282ab8c715c86 SHA-256: 5ad527b8aa3516536509d6caa00b97443f981280ed0f5e8de2f38077c2127b6e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. These links are likely used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c07a64c5b---vabitiwinobukonis.pdf In PDF document text
    • http://mmsmarin.com/imgimage/file/musasikejijifesu.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/19348949818.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/bulerewegiba.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413da38619f---ximulexopadidutuman.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/7736379166.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/51917879466.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/53821258579.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/vfutr8o2h4qrnkd29lnhk44pop/gojetoturerov.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/40750094417.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/vixorudasegasukid.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/vezujelizimowazemiger.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/wikarapijomoka.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/lifediwe.pdfIn PDF document text
    • http://klhl.com/userfiles/file/laguki.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/1559331907.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/zivipojalopobowolepukesan.pdfIn PDF document text
    • https://wsbtitan.com/images/file/88149227747.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/97040590509.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=android+9+how+to+move+apps+to+sd+cardPDF 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_off0000d980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD980 17756 bytes
SHA-256: 8dd20c06725d48bcf15ecf7152bbd8938c0f9eaae1d1b852c79f6cdb15590ef5
font_01_sfnt_off00010776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10776 11032 bytes
SHA-256: b798665fb68553f3577fba76ac088c5620cc2921256dbeb1cd9efe87d7f2bacd
font_02_sfnt_off00012114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12114 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1