Malicious PDF — malware analysis report

Static analysis result for SHA-256 659727991fe45785…

MALICIOUS

PDF

74.9 KB Created: 2021-09-13 12:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: de5161dde68fff8252613130c3872420 SHA-1: 78c7f39374901e19d1a777341cca3cc2ddcd70c7 SHA-256: 659727991fe457855d3e02f64b285028f40730bda312996101c36eabb05be1ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm used for phishing or malware delivery. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=gangster+vegas+hacks PDF link annotation
    • http://envigest.cz/upload/file/54168215670.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/fovidaj.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/desababexanudiluzizive.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/41757499123.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/80275717021.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f59b8a4698---sitov.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/nazobuxugubovejiriminimav.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/95123369686.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/duvexebipuzubanirunapo.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/xetugipimalav.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/kederagajenorilin.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/35251443034.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/34960958905.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/latalitijopajafurife.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d044ce8140---gegesiv.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109111711377772.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/19429544948.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/milubasodotetepa.pdfIn PDF document text
    • http://irollee.com/userfiles/file/fisapafugin.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/mojoge.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/47311beb114b70e4aefdd35bb555bfbe/15241162551.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/84892736761.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/16322286505.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/rewaf.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/munew.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_off0000c361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC361 10448 bytes
SHA-256: 719e4f77ab0a29586a44be17ab40daa904b0576f83730200f396789791132ea3
font_01_sfnt_off0000db22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF334 16576 bytes
SHA-256: 98ed21b4999d9893da0b4c1bca13bb5f3031d8c34b9d67ebfb2cdb7d09cad96b

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