Malicious PDF — malware analysis report

Static analysis result for SHA-256 4165567bd71cd99c…

MALICIOUS

PDF

78.9 KB Created: 2021-09-07 02:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a408b8ce1b4702f972a636a00b4dfe40 SHA-1: 9ab1ef80e58a9594690e416ff62f2d6f2af620e6 SHA-256: 4165567bd71cd99ccb0520790edfc66a4cba5333827d762c3735ce4d73b60706
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://wintec-samu.hu/uploads/files/34276911982.pdf In PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/30876096396.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/27163265284.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/zepodepakakudagujoven.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/vuziditagitivipenegomude.pdfIn PDF document text
    • http://ccshecea.org/upload/files/65828316040.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/s0m4642i8keq98v3f3grgv6f7o/90437365077.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/xatoboxa.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/1629272512598.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/zuxewubodejudi.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab8d7a6168---fojajuxarimifavebilafarun.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/zuvixunefixefokanefo.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021062423281641.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/56825959783.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/dusore.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/gvfh2a5d7rof9enk9qc4adf7d1/41631168987.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/ohp3f2i9761v26nanc01q0odt5/94748124814.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/49299e48b30685b6e1c1bc0174a4fde6/82994623285.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/gadevove.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/28698049450.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/2d73416cbd3e6fec0aa62a3390d28d53/motedotarati.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/gawulukevofolik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=american+idiot+chords+pdfPDF 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_off0000ce09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE09 18352 bytes
SHA-256: 5e100ad8f65cf45a19f79e57e3331f74ccc4eff6b1d0baccb8a89fb6a6801910
font_01_sfnt_off0000fd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD82 10820 bytes
SHA-256: d446c4de4b329233a94abd14a353980bff0d607e3628d24ad3da4979aad2aab4
font_02_sfnt_off00011642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11642 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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