Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcfb3f578cb4faaa…

MALICIOUS

PDF

81.3 KB Created: 2021-09-03 08:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6f164702b9ce220b68756ac34fa005f3 SHA-1: ae025971584473ac3ac79858afa4d748ce857cd7 SHA-256: bcfb3f578cb4faaa01734e5258b30f5f772e55d36d0eb41ec4d1e07550e28b99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/4u9nngue9mm1hbspkmki3tal75/putin.pdf In PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/wunafanejokabavajo.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ccfb06ca5---mejijowabiv.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/nebizidunesinerotimez.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/wojag.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/xugazi.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021072205080266.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/fimedudoxabuxo.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/qbl3089a1sne2f56u9h02adtqh/bilizikenala.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/21100487623.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/76902470767.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/72909064234.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/disuminobewixo.pdfIn PDF document text
    • https://keongracun.org/contents//files/4135754054.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d00bf2236---wotagagasajig.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/4ge4v4uj6vct8jbbckvqvpan8p/67996125059.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/jubawutulos.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/fexepabeduduf.pdfIn PDF document text
    • http://houselandia.ru/files/jipix.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/781ae6c197d570a3fd9662f6d7ade426/davurowupiwi.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752d83f36d6---zumovabedevebinewimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=lashkar+mukul+deva+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_off0000d9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FA 17328 bytes
SHA-256: 0483b22f662e8b39c5c9511c50fb5a1d370e1ec0238e8cf5c4c350603e2a70f1
font_02_sfnt_off00011f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F84 10564 bytes
SHA-256: b2ecafec9a73b1dee2ac83d05d5fae3eae39b4aa631dd31c2f739690e8fd1cef