Malicious PDF — malware analysis report

Static analysis result for SHA-256 90057fa03cc2275d…

MALICIOUS

PDF

85.4 KB Created: 2021-09-19 00:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b4e731d18745189e27843a2b1992b283 SHA-1: 932f7ebfe871b921e6329800a7b0dd798025c647 SHA-256: 90057fa03cc2275d33f8e47956ea09b5320ab2a723b3377853ccaf4d9002fedf
216 Risk Score

Malware Insights

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

This PDF document employs a social engineering tactic, specifically a browser extension or update installation lure, to trick users into executing malicious code. The document contains numerous links to external resources, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to download and execute a second-stage payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pistant.ru/uplcv?utm_term=puffin+android+tv+browser PDF link annotation
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/79fcc6c68c5f03e536a3e372772564d6/30345873844.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/zanezeparumi.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/ririt.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/rotudofumedobav.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edc63cf4b7---jafixamu.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/50691590035.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021919523283862.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/24757652421.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/perununi.pdfIn PDF document text
    • https://noventa.cz/media/files/file/virisutuwunobuzapi.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/joxaboxonemizo.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8b9fbad78---55256652051.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/jukikib.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/xufafubesufuxemutisudaku.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/23037308316.pdfIn PDF document text
    • http://henseltech.cz/userfiles/file/37511633944.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/fofoziboxixamo.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/9914923472.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/58412738053.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/lutufipikosad.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/jamapivubanekipas.pdfPDF link annotation
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/55057020840.pdfIn PDF document text
    • 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_off0000e4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E8 19068 bytes
SHA-256: 11c0fbd825ec148b9ad3213896ad39fd9041b552dde7e59e52c11aea60e8d509
font_01_sfnt_off00011729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11729 10692 bytes
SHA-256: 04bf1aec10d719f31da24e74ad4d5ccc1b1b3795895dc1c3c989b50a47a47147
font_02_sfnt_off00012fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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