Malicious PDF — malware analysis report

Static analysis result for SHA-256 ded57a9a502d6452…

MALICIOUS

PDF

84.2 KB Created: 2021-09-04 18:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 972739c1b8292ebfbeb08ae51679874c SHA-1: d215f582aaa7d77414814c9d985f091a415b23e2 SHA-256: ded57a9a502d64527faf383d736cfe7d16d9ef9edf175401dad0ccd9a061eb9d
172 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. The presence of embedded JavaScript and a link farm pointing to various PDF files suggests an attempt to deliver a second-stage payload, likely exploiting a PDF vulnerability. The heuristic 'SE_INVOICE_LURE' indicates the document's content is designed to trick the user into interacting with malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://regiefranchet.fr/userfiles/files/pokidituwatuxirisam.pdf In PDF document text
    • https://securitydm.rs/slicice/file/79277679594.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/luwolutinewesetumuvo.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/74863344506.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9efb200d13---38038772681.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-8-21/20210821031201875675.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/dofitogibitorape.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/21401166758.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/91519784625.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/xubumumosotunudaj.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/kulamisejevebikiweg.pdfIn PDF document text
    • https://agermag.ro/mm/file/12083331193.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/tjqlh3p6coh2tqch269t5u0pu2/99761061127.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/84987812485.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//51810685343.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/6e38d8b8a99a5d0ba0fe8402c3e83af2/96161901830.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/zexanilomaripawafuz.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/radebupagijotipuxeni.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bd2c62d64---86058017241.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/gagisujimesodes.pdfIn PDF document text
    • http://djapm.com/userfiles/file/bekegolamulotijaw.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/kapifetodiwutamiz.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/5f16813aa6007346988e87674baa9960/zajavetalirilepaxebobil.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160ad182eb79f7---fujamafopubikivu.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/50183416507.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/rajevedowuto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=receipt+template+pdfPDF 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_off0000e49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB6 10332 bytes
SHA-256: ac7e6d81ff1c1201b62e8a123965dbfe39a32ad7a711b81aa378924da2a3fc8f
font_02_sfnt_off000113ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FF 18052 bytes
SHA-256: 81656aabedab0992c3ccd50112513cb49955f22a5bdde9154297a3ea038e649e

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