Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c28606147ea08d…

MALICIOUS

PDF

88.6 KB Created: 2021-09-15 06:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 786e01bd1f2f0f0a6696d6a173d09771 SHA-1: b8b63709906c430d9e086d48ac9957dc14240473 SHA-256: 71c28606147ea08d84688f8f25452923f8cc5981a5c620466e2330bb981f8bad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm containing numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to lure users to malicious sites. The document body was unreadable, but the presence of multiple external links and compromised CMS upload paths strongly indicates a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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://purofirstli.com/userfiles/files/60698781655.pdf In PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/96120025486.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/majalov.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/20502504302.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/33554430694.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c63f49d1e9---69888044333.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/16781717642.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/50909343660.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/kovexam.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210903101244.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/66224892031.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/39692914571.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/48132937392.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/4898638336.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/d71ed3be53e35f758cbde9b9d897b04a/vodoxosizipapej.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/84700509296.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/gafib.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/6931096366.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/nubuwegaroridibor.pdfIn PDF document text
    • http://integrotech.com/zdjecia/file/zidimazegofese.pdfIn PDF document text
    • https://ivantomanov.com/userfiles/file/wimalaki.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614149880efd7---fuxubasewixanikeb.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/dozotesika.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/82095666492.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/1149028623.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/632ecd03e5e63f43031c0ed2a9bf7ebf/wovas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=top+porn+android+gamesPDF 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_off0000f759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF759 17552 bytes
SHA-256: eb3e7be154c55b585cd5b0217b3ad724aa93a205432b3ee90b8331943eea2fea
font_01_sfnt_off000124c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C5 10556 bytes
SHA-256: abf96cb005e18739779987b21c0fdc9dfc2560e07daabc376243122e4873dcc4
font_02_sfnt_off00013c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1