Malicious PDF — malware analysis report

Static analysis result for SHA-256 c508339081695a51…

MALICIOUS

PDF

87.2 KB Created: 2021-09-08 07:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 060a7063e2f7e5062e5a7ba298d7d1fa SHA-1: 80164d779948f6b8490a3604b3489a5f7be55c16 SHA-256: c508339081695a51febbab4c87feb7cc22e3f9fd9fb42bc4499a9eafea01c68c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple URLs pointing to various domains, many of which are identified as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery through these redirects. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/xunelemobuwevorozunej.pdf In PDF document text
    • http://uralinteh.com/uploads/files/84019157697.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/13410772832.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/b39225deb7aad79f7b49160abd8ea1c7/xotazuzujo.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/35569592379.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/46420609778.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/358rmsakofqbped9a8hrprveb6/titekifebedaxisula.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/lufujatumetap.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/botumajabonebuji.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc550b7289---81600486986.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/2de7767f3b39a6f441bbd144f53cbb80/49161960743.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/wazovosexumugamaxatebedon.pdfIn PDF document text
    • http://rubensova16.cz/files/file/53230280672.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/hf3r6h2o2t2gk35jis2u12b934/wuwip.pdfIn PDF document text
    • http://lovesenergy.com/file/59822372855.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fd42553db---rosuludujaxajepivagej.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/litogefemawato.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/sunipapilafojojelalom.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094b3bf11e73---gerulalukujamoz.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/janoliwo.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/93898999328.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/jf10ishb1rrqqhn9epm4g8a11i/wijodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=manual+thrombectomy+cpt+codePDF 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_off0000f18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A2 10868 bytes
SHA-256: e0776446a83d5814c1f943ac9214ad573b7c3d3743e3b3f1c4fff839a3229351
font_02_sfnt_off0001225b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225B 17560 bytes
SHA-256: a1af53d44abcd48fdd1321cb84d6980c97b14176c6a7932a0d2e1bed68cf90e2