Malicious PDF — malware analysis report

Static analysis result for SHA-256 0245d54310aa7c80…

MALICIOUS

PDF

76.2 KB Created: 2021-09-16 11:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a044425c362c26842c0897cf48e6ceb SHA-1: e9bcacfd52a9e18890c8b340aef9702d040d69f5 SHA-256: 0245d54310aa7c803d314475f9bb9ca0ab2094fdee5495798c60c02e53186803
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such sites for SEO manipulation or to host malicious content. No scripts were extracted, but the structure suggests it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.smartlandgroup.com/ckfinder/userfiles/files/97102289779.pdf
    • http://branpc.in/ckfinder/userfiles/files/6007205794.pdf
    • https://karolinanowak.com/userfiles/file/13608906384.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f721e7fb69---gibewubofajuvazofojuf.pdf
    • http://solarwindependence.com/ckfinder/userfiles/files/45718837626.pdf
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/12167558614.pdf
    • http://tramtronbetong.com/uploads/userfiles/file/77537427259.pdf
    • http://flirtproducties.nl/ckfinder/userfiles/files/37659498380.pdf
    • https://lentes123.com/aym_image/files/84540770541.pdf
    • https://realxenon.ru/uploads/files/panikizitut.pdf
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/2074069300.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/nirifumuxufidumegaper.pdf
    • http://home-plast.ru/foto/files/zebazumebed.pdf
    • https://mimpishio2bet.net/contents/files/tapel.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/404b29322685869acd417de286a50c7f/48160130289.pdf
    • http://elskenecologie.nl/files/fanixud.pdf
    • http://medwin.kr/userData/board/file/84067420279.pdf
    • http://kirsanov-maslo.ru/uploads/40126802821.pdf
    • http://studiotecnicodama.it/userfiles/files/xenitekizeti.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161390aae33ad9---puxasiwosedese.pdf
    • http://happyhanool.com/ckupload/files/xakutojevojuganirizumuva.pdf
    • http://slsnn.ru/content/file/mogejavos.pdf
    • https://ceccardolj.ro/userfiles/file/75830231232.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+find+deleted+video+on+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6d4.bin
ff5ac5c64a208c4f05b4c3fd36a9f2c3c50a20534e57e012ba0bbc6e51d52784
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D4 10320 bytes
font_01_sfnt_off0000de34.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE34 16792 bytes
font_02_sfnt_off0000f646.bin
bd67b6e299e2b1576584c382b14f1b80deba298a2b0143391d2a545ada844045
pdf-font-stream PDF embedded font (sfnt) at offset 0xF646 17336 bytes