Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8dc1c9aca8f572…

MALICIOUS

PDF

85.8 KB Created: 2021-09-17 02:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: fe2914a3c18cbb6d35589b64a585b255 SHA-1: 43d57d7e557bcaf4062cc326d7c6a7e58bc52bba SHA-256: bf8dc1c9aca8f572facaaa46f8a09db2f02406e8dcc16a432466de44d03c6552
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external PDFs hosted on various websites, many of which appear to be compromised or disposable. The presence of a link farm on potentially compromised CMS upload storage suggests an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://linyuepharm.com/upload/files/xusumobidazimazot.pdf In PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/36996112191.pdfIn PDF document text
    • https://migger.dk/userimages/file/60713628428.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd15766c75---ruxakamafupuxapedusaru.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/ganorilajaxanel.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613169b7ebaab---dovabiwixo.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/vifedakadabuwilemo.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/woturoripelax.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/99069873601.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/92537850638.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/49799354973.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/50575602462.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/56667607762.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/nepefefupusote.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/vuponika.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/gusarebalujopisipisi.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/ganabopokidudonika.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/88854895067.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/42028587950.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/nufipinapegatorale.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/13728544191.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/jusozaguzurowegozi.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ihvr038hj8q9gu03et9m85vt57/21157439547.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/709irkpv2qh9m0u64spfc0jpf6/ranelutuzag.pdfIn PDF document text
    • http://e-district.org/userfiles/file/84702556026.pdfIn PDF document text
    • http://efeotokiralama.com/Upload/file/ravugesi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=systematic+theology+pneumatology+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_off0000e7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE7 11256 bytes
SHA-256: c2f45dc91ea6d531d23f44a74d9633779b439e1502bfbf1e5be41daa7c904830
font_02_sfnt_off000119ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EE 18752 bytes
SHA-256: bb6a5e5d6f3b6aa0df2bf3114f259c101b98d896dfcc73b7031a2aab8b5ecd3b