Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aac9b65908d26df…

MALICIOUS

PDF

72.0 KB Created: 2021-09-24 21:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a1a23ddfd81a3c0d5af66403e1e790ec SHA-1: aa9cfe7de52ec3f9dea996b49eb563863dbfd9da SHA-256: 4aac9b65908d26dfdf378d9544d3bbc1b5b81958aa7267c574d036f20896d075
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to potentially harmful content. The presence of numerous unknown URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://kondicionery-domodedovo.ru/upload_picture/file/misopato.pdf In PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/72929711331.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/a1usgg7mvqnhsjovmho7t7uhdl/revoserufifakonixufaripu.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/35603726552.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/9751380431.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/65570097054.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161353e367aa0a---65929270751.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/63249338886.pdfIn PDF document text
    • http://cannamelis.com/userfiles/file/85676408025.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/vepufidaxujom.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/bonojujuj.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210921/0544496473.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/70943275507.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/gugejulisazinerofeniguv.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/51505313770.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130938288386---63968567889.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/gijidivazoparu.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/divofefakadexunapevatose.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/vikupopafukasowolatanivux.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143a3ebadf2d---96594871950.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/tamela.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/83780052349.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/47984202045.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/8d586e004ff76277f5b602a0c254875b/rutokaropazogojalemukulaj.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/14021550365.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=dr+driving+1+mod+apkPDF 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_off0000b6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A9 10500 bytes
SHA-256: 1f6b409f37e0cc34711d31fb1fb05bce72aba22eac7797332bfe70ae644c8d00
font_01_sfnt_off0000ce49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE49 17312 bytes
SHA-256: 30caa90f201a0dc9b364d2e89711744600e760293e9b54b4692c0498e8331c1a
font_02_sfnt_off0000fa50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1