Malicious PDF — malware analysis report

Static analysis result for SHA-256 303e3b8080ee6694…

MALICIOUS

PDF

73.2 KB Created: 2021-09-20 12:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 743144fef8dd59ceb535173f0c61ff24 SHA-1: b48d5832bd6f752e280bad3f4e17a1a77d8faf31 SHA-256: 303e3b8080ee6694b77de1919a663ba75f610d3959824c557f64598349e89b26
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with multiple external URIs pointing to potentially compromised or disposable hosting sites. The primary purpose appears to be directing users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://inwebjor.ru/uplcv?utm_term=use+of+airdroid+app PDF link annotation
    • https://99shayari.in/userfiles/files/17527966338.pdfIn PDF document text
    • http://usmleworkout.com/files/file/xubagexitule.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/54806910247.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/radagisugixekovu.pdfIn PDF document text
    • http://minhanh.com/files/lomafiwebatajatumupepinu.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/noguzujubamilagafatos.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/xovevase.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/16515391340.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/naronuburepewo.pdfIn PDF document text
    • https://rm-parketi.si/uploads/zotesigagupupogafuneden.pdfIn PDF document text
    • https://vientangluc.com/upload/files/rugomubumep.pdfIn PDF document text
    • http://salwex.hu/file/mutefolovutesifisuwigup.pdfIn PDF document text
    • http://seamacros.com/upload/file/37234658901.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/67921180789.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/34142593497.pdfIn PDF document text
    • http://seamacros.com/upload/file/suvix.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/94123a52342574f1d1394c6a0184c565/92178013406.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/85868828013.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/ranarorufojowu.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/pomutiwex.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210908123534963.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614390fc347c2---gumujuborujumixomebalu.pdfIn PDF document text
    • https://polandpools.com/contents/files/5479842929.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/73653712499.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139672b33875---77058706710.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_off0000beed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FF 16164 bytes
SHA-256: 7ac9c7d956e95f74fd3d0eb1e264ce02e7732d2e5ffc069c2ad94f61a25600f2
font_02_sfnt_off0001005d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005D 10252 bytes
SHA-256: 1656f084f1e1274e33365ee46f121bd1aa2b3c8264c4645577c3663304343cf2