Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6bcc8b6cddd87d2…

MALICIOUS

PDF

83.6 KB Created: 2021-08-29 11:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 658a2e72354eb640a1da805c47058d86 SHA-1: 6ad82ab30d0a819d8de527df396ea0a9bda6a51e SHA-256: c6bcc8b6cddd87d2c6f46e1f24ce7982fbf8edb9cc0fe6329566550e6d946038
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being a link farm, with many URLs hosted on potentially compromised or disposable domains. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://konstruktor33.ru/app/webroot/files/files/towirigegalerej.pdf In PDF document text
    • https://lotteppta.net/beta/assets/file/luzudi.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/697724173.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/wekamopurofuxubelis.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/dotigezi.pdfIn PDF document text
    • http://tayles.com/uploaded/dinefedazaxefa.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/65395488838.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/10572169561.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/lufataw.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1b10e57f2a---winobunomamub.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/legudeneb.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/40437540113.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/nskb2jvr5o0mtgcrp2r85l35n7/9524299482.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/4832d41339ef1bbb716f456439cd929a/46048659378.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/18746423264.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3af3bc3f7b---javagerosogeberatomedu.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/12d3dce2e4234a921985c4da7ea40cd0/wililasesegojebuzi.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/83633525566.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/6rmfrlgcfj1bfsqtm38alev52j/93293915057.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fde3d4539b---42873223275.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/0b8c9b58fb32f7196b398ee097b7eebc/salowuxewawozafexekabonot.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/16723318898.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/fomejofonipi.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/34486814919.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=lexapro+for+panic+attacksPDF 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_off0000e32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32D 17060 bytes
SHA-256: 243c564914946d0e1c9d9f7c5cb2d36aa9d0f2a285743c62fe1169aeb098a602
font_01_sfnt_off00010f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5F 10580 bytes
SHA-256: 693f40fed45516375d95cd55395d2715ce9dd26ca053a3d2e8e3d91d111f70a0
font_02_sfnt_off000127b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1