Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac88485e7654079…

MALICIOUS

PDF

85.5 KB Created: 2021-07-09 02:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4969fd88c6823fb0ae191e21cba127e4 SHA-1: 8d518e26ba17e2b6ee1aeb99f7bdf76a32d851eb SHA-256: 7ac88485e7654079d56d8c9adbbd64920fb7e9d6957e91de3b1dd6c97ec5bd67
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://ndt-tl.ru/upload/file/44914302633.pdf In PDF document text
    • http://houselandia.ru/files/30876629432.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/feriraweras.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/pature.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087a0e6c6aea---66631806896.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10aa723e8b---vatavomota.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/e39c3ae14bbc7a6936a682a331dca576/fugatodikamobiwafekepe.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/0f962a51285da8c2db57f0ce23c521bb/rikogazorivebuzugabitof.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607d28f3629b2---2423862806.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/31gieqefe8q5pt5mfms1gck4k1/ruvapilipunaduwumonegif.pdfIn PDF document text
    • https://actor-conseil.com/files/file/lorimobewe.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/89021407837.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77d203b2b6---29853333967.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/47477709090.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16075bebf07e39---63782942045.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/92553053221.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/dufatuvajedibezajeve.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/96717386611.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=once+upon+a+time+in+america+fullPDF 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_off0000eaeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10302 10600 bytes
SHA-256: 228115553198bf6cf9f1bb586cbb1307d65a202c78a429046193693d386aa48b
font_02_sfnt_off00011b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B34 17332 bytes
SHA-256: 37d97a487f51e65b815c905891ea7f9b9cb3f54fe77283fdc4f980a936e6361e