Malicious PDF — malware analysis report

Static analysis result for SHA-256 61687c1fc50caedf…

MALICIOUS

PDF

74.2 KB Created: 2021-10-16 09:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f168f2f1e6c9f547cadc42774857616f SHA-1: feaae50e4fd0ac0db9e2a95d5227f6de89efbef0 SHA-256: 61687c1fc50caedf9959faf2fecbf606bd82c8371e56fbc8bd0a318e92d3e0d5
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites or disposable hosting. The primary purpose appears to be directing users to malicious external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://nomylo.ru/uplcv?utm_term=drawing+to+color PDF link annotation
    • http://studiofagiani.eu/userfiles/files/vimapedubez.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16167e2c4e73c8---kudelekutitixunibope.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/kijapotowozomovupakotak.pdfIn PDF document text
    • http://fitviewer.com/files/file/56524287107.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/46326154920.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/4155550694.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210927_D1BFB64CCC5ED124.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab1d52e8f3---nubinonanusosewifuvi.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/63549153926.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/temejazimuzujatidimup.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/41786214537.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/jerevaguxozo.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20211011938421111.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/dexosimadiriludatamiku.pdfIn PDF document text
    • https://healthresearchinstitute.net/userfiles/file/wojikor.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/39769613732.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/84178062032.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/zokowiduxeleku.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/58100869947.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327defeecd3---16474447484.pdfIn PDF document text
    • http://vhshf.de/File/mokipu.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/77214387161.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/42558550644.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/lixaxewakadori.pdfIn PDF document text
    • http://innotack.com/userfiles/file/11629585125.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146d0306cfe8---12598142047.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_off0000c3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B8 15916 bytes
SHA-256: ed9ea2a89d6f418e588e42f7dccaa62f6c60e082a814c91587af63a48951183d
font_01_sfnt_off0000ec46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001045d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045D 10192 bytes
SHA-256: e3cd95a5f198d0f8b55ec68dc2e251bacca5f78770aee6ca5e744f9ea0f776a1

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