Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c6053c2457ad0cd…

MALICIOUS

PDF

93.6 KB Created: 2021-08-23 14:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 362bb451f981a6886304febbfb401a07 SHA-1: a56c14a36d25323d4025b88829e2f35df02d9d02 SHA-256: 8c6053c2457ad0cd69e249f3d564871415b77161f0ea541e24ac200d604a78d9
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to websites hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a link farm designed to obscure the ultimate destination and leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/7najevuh7n3agb211jc9ec2iec/rosupeweduruz.pdf In PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b90cee4a869---39332575873.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/zolofojusuwijivi.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/52603410263.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/zajogeda.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad99ddefef3---46479151846.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/1664cd984870cb237e2bab50c2ac4cae/febosodopepiwagepex.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/732de44d68c108c9ec6d1ce8d8e793f6/fopibega.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/59405709225.pdfIn PDF document text
    • http://deforma.it/userfiles/files/leviretixovib.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd4b57e63a---korifiwesesikavupanipidig.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/78132004148.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/14596096823.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/5377fae53d816f3737c0dcd8c17b7d8d/topedesarisuvisi.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/53846886878.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/rnpf40t6k1ears0o3vkjipikeo/78512672163.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/c9c56c42c46574c322411ff10d28c3b0/59107040014.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d276acb261---wudeserinasoropun.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/34698538920.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/vuvkbjt6tmk7mljqhh3ol8tvu5/suzizafolok.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/59131163655.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=sequoia+national+park+to+yosemite+national+parkPDF 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_off00010abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABF 16888 bytes
SHA-256: 938082a27f4bdef2c773d8b25e51326345b5d2d53277ab8ea682cfe7367cdae3
font_01_sfnt_off000136dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136DC 10940 bytes
SHA-256: bf275f138c6cd35e60badb2a958a24249026d007f6bd84de43f31e0497095ead
font_02_sfnt_off0001503a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1503A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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