Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad2662eaa6200e88…

MALICIOUS

PDF

86.2 KB Created: 2021-09-16 23:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a3fa8b0a10f917cb04d2054cf68597ee SHA-1: 179d7e3129228d4486939c519c55817259de380f SHA-256: ad2662eaa6200e88e7203e6d1efd01f2cf95ef80b8318ad9d0e3a6fd326e2a0f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves leveraging these links to potentially deliver further malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://infrive.ru/uplcv?utm_term=introducci%C3%B3n+a+la+estad%C3%ADstica+inferencial+pdf PDF link annotation
    • http://gold-carsales.com/js/upload/files/wukugofarujulipifefi.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/88817172738.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/nefalolikitori.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/129fb7aa7ee6aef177a453b2635d0093/98411159817.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/181b802627270bf3a7f83cbb1affc575/rotuvur.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/letezamibegemizob.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf9b122291---lividojimazu.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/wotivexo.pdfIn PDF document text
    • https://subded.org/userfiles/file/62109915210.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/3431308997.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/37372792381.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/20840246617.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/49827300219.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/67506410725.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/vifedezokam.pdfIn PDF document text
    • https://wrd13.com/force/file/90329972135.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/69371608573.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/danel.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba8f78cdfe.pdfIn PDF document text
    • http://anpo.vn/upload/files/95407154819.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/guvozokonuvu.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/24799040467.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/kinarinamefuvagofo.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_off0000e594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE594 10864 bytes
SHA-256: 04c9d6724bc0b5c6005acf2f3b099c193d786d12f911994084205c47622aae5e
font_01_sfnt_off0000fe7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7D 19732 bytes
SHA-256: f0a0bc315e069d5af9de7eb89f437ad6eb29ea3f01be9bec719d018f4ed633ea
font_02_sfnt_off00013087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13087 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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