Malicious PDF — malware analysis report

Static analysis result for SHA-256 ece72b291fa7c9a9…

MALICIOUS

PDF

83.1 KB Created: 2021-09-08 21:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4a08336ec3691af0e6c13fbb891163f6 SHA-1: 9939b4ed51c278d11cf7f635180245d3890d2b6d SHA-256: ece72b291fa7c9a9d565dc45420f2a2d38c161b63daae43ef39732edacea3ca9
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, several of which point to compromised WordPress sites or disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://vizugy.hu/uploads/files/files/girel.pdf In PDF document text
    • https://arichaindia.com/userfiles/file/53921138304.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/4096035648.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/78700746385.pdfIn PDF document text
    • https://kenadong.com/contents/files/6826838327.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/99775843772.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/24208066782.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/rovekapuwuk.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210902122635.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/rixunifufofajafuzax.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/11195721436.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/88144284810.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/7b57phfjb6umujjloaaatp7n2c/gedejowabewuxuxogiwi.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/vilokorojepivazabopenin.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/liludizu.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/6a8eebe3286d307d40470c70e3abf196/kusewujilipivatujonigup.pdfIn PDF document text
    • http://faradbox.pl/files/file/pefajepupixolowetuxi.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/17421458427.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/samirifotetiravigonun.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/tevagegaju.pdfIn PDF document text
    • http://capital96.com/userfiles/file/majufevogagejirilanig.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ec673cd8e---20070866483.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/dugalakavevixepudat.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/runigisibuzile.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/45924405579.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=canon+800d+specifications+pdfPDF 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_off0000dea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BA 17620 bytes
SHA-256: e2e2a50b4b4bc3ecb73512e2aed24f7458e0cdf4f26d12b7779a5b87450b9bb9
font_02_sfnt_off00012552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12552 10828 bytes
SHA-256: d32a7097d77d4a07e14176878cf31cb1d6f0c66a3647986f90188e5baed66eb0