Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e673ea308edc86…

MALICIOUS

PDF

72.1 KB Created: 2021-09-03 18:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c18c8104a5b3a3bda90e222c1a4812bf SHA-1: 8173d4ec06812b64d6c9bc43a8e9a0d0f65e1899 SHA-256: 85e673ea308edc86c540a83044988bd2d2b9561bb6975326bdb06aba560d4bf5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=cours+administrateur+systeme+windows+pdf PDF link annotation
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78867120745.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/68782805097.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e0fca94da---tugofarilareja.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/4kus36d6b9j50bbtae9msl5vs7/nonerobuj.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/82991668468.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b59a54efb33---36620324807.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/9201415182.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7ab3a7c24---rimupejopamimonim.pdfIn PDF document text
    • http://vtaky.sk/media/file/jejaxepom.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/tofenuzivelejejunumi.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/f6500d8f90bb20bc2b7f0d1270d7e1c5/dolukivafevuwugimotowi.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/guguwifamolu.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/31567413496.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160b3eac7cfc59---fepakob.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/c4b61a3ce10a93e83f90c50a1ea9b095/35784928495.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/73930850977.pdfIn PDF document text
    • http://bananamusic.tw/uploads//files/202108090340594146.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210707_155917.pdfIn PDF document text
    • http://packamate.com/userfiles/54991419915.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/80589993161.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-8-4/20210804191155847775.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/48696232080.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/8f8444ab9359957717dc43de9140b542/97958476025.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aea7be79900---kikivipajerawome.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/aa89aba6bf9c628a70a48def157f1bf4/63257019971.pdfIn PDF document text
    • https://lapdonline.org/file/3748354902.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_off0000b950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB950 10944 bytes
SHA-256: 42445a4d057bfae468893375cac1a970b364be6d92c508decd8173fec02d904e
font_01_sfnt_off0000d2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE3 16108 bytes
SHA-256: f8e9803043f7b01af9a835fd21353a6c6afaa3ca43513c32612a97734ac563c2

Open this report in the interactive analyzer, or submit your own file for analysis.