Malicious PDF — malware analysis report

Static analysis result for SHA-256 5632ca0fe124afa4…

MALICIOUS

PDF

85.5 KB Created: 2021-09-16 15:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 20d6ee47b0c70cc7170b5f6bf0916c50 SHA-1: 63e01307377ac39a6369788aba83ef2cf0330e84 SHA-256: 5632ca0fe124afa408fd3296630f3922134560c125475f0dd1b068f01c9a8da3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm on disposable hosting and a URL with a 'utm_term' parameter further supports a campaign designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://coretry.ru/uplcv?utm_term=draw+a+stickman+epic+2+mod PDF link annotation
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b7e9ec6e2---41554142716.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428da4968b9---kekimewekarejomirugoxo.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/33260479923.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/tajenadojigopibovulurak.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/nufezasunosonazadam.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/48941022729.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/91196174977.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/zozona.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/lumip.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/wuvedofa.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/mewuxaridufemapejipoji.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/gopaledog.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16135d8e87c66e---vusuzumopoxujifilemitipe.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/16306181164c5S.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/fufavezotojagafod.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/49906428354.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/fezirumoveber.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c4f455bfef00da05fc984364237b770a/xikuzejagoviked.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/0661b223c749ec710630a315de2c8b19/juzeserefurijuwelebetare.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/kerijixamonox.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/pejadofo.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/rewex.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC17A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD991 10928 bytes
SHA-256: 6f10ad546ffe25f2dc11de836c333debda6479ce7110a8fda1c2475848a2e484
font_02_sfnt_off0000f2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FD 24812 bytes
SHA-256: a7ffdbed02986ea530b192a65d3217edc1c602163dddbf3d907fa42b5bf94ea3
font_03_sfnt_off00013012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13012 16812 bytes
SHA-256: 0ff36aa4c5a475821ca0d14c0579b46935bf8139a78f82ca64570f2871a543f6

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