Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc54c119cdfaee64…

MALICIOUS

PDF

85.9 KB Created: 2021-07-21 19:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c66ee75508b93317735181443799a80a SHA-1: a58d1ee746b1a888217bb8d76008f7f5f1ee9d72 SHA-256: bc54c119cdfaee6486ad23f83fe29ad083548bacde76db772609ff7407a4ae8c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised CMS upload storage, suggesting a phishing or malware distribution attempt. The document body is unreadable, but the heuristics indicate a deliberate effort to host links on potentially compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://aksukartela.com/images_upload/files/58552789210.pdf In PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/d7ebb6f04d23a29ed9f670b53708daba/potidu.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/89f5950da8f23068a7c968341b577a63/65782753558.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/6ec803ea4144df083d343f2859bed916/xopigidumi.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/3d5f77660d19a57085f0147109ff0c17/xolifot.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985b69cf536---pufitukuvel.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6880cf154---70516663373.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/42018db6f603fd1b957380caddfb36da/54405902925.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16073aab625e69---jogivopitivareliseziludef.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/bed053e6d1e1296d3708486b8d92ac73/99496247103.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/jefimitivirez.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/95q5vr54fsj7sq7vtc441q1k6n/69352415227.pdfIn PDF document text
    • http://nusamulticentralestari.com/Uploads/userfiles/files/22600760070.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0368de92ad---6570049740.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/53760008101.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/5558033322.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/wavalowuwobavorufen.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/tetuzuxagomapuderunusumug.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/rafakekowo.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/cff48902f6bdb378f325bad367818d27/zuruxu.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/peguvo.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/21771480966.pdfIn PDF document text
    • http://eva.am/files/d14b9ed8ead03a0c.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/miwok.pdfIn PDF document text
    • http://mertlakustika.cz/images/pages/file/pojazam.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af9385a4855---11683100574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=quality+management+system+principlesPDF 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_off0000ee3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3A 16256 bytes
SHA-256: 83907afc2159dd4223b679a041a4102b16f286a523a38e575b9df91957162087
font_01_sfnt_off000117af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC6 10868 bytes
SHA-256: 9c0eb95cadfd17a245982add2f3bd922f8445c0a8f80bce06ad8324dd6e8c199