Malicious PDF — malware analysis report

Static analysis result for SHA-256 6810c90a5fdbf51d…

MALICIOUS

PDF

86.6 KB Created: 2021-08-30 07:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b97cd1df6da93ec19998b664335e6765 SHA-1: f0a21f20c3dc8fac69daf0623565ba252a4b0721 SHA-256: 6810c90a5fdbf51d4e6f4f3b5a83bc24fee2871a7fda05a9b6ae0b69dddd0e73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose, which is likely to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/inrk840rg49k38396dnhafahu2/7466113931.pdf In PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/57983542998.pdfIn PDF document text
    • http://saimiri.name/upload/file/jupek.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/68751702302.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/hn4ido4iqs32u90njbk71ao5na/70809665354.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/minigebok.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/sotanizenaxal.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/kasukewutagekokuzi.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/39734149936.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/48198137790.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/lusoza.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/gamikijuvenimokegukiz.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/20336135193.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa64c2e5f2---36857747146.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/49404499331.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e64468d6d33---fobuvewu.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/65660127492.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/c55be16e289c5a274aba1607ec7b7294/dewamumoviwet.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/xelofopagesiwawawaje.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2d60ece15---mubeneta.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/c36287a4012d0d1500c88f7c88827016/redutewuwofotafutawaf.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ujlehcm0h8e0ms03npnr9liv6m/pegatasije.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/sibixufaro.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/79776701291.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a017c2335---guwonamagijenunav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=calculating+yield+to+maturityPDF 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_off0000eb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1C 10788 bytes
SHA-256: be102e082004885471c7ad82304da73056b139aa39743c5d97b09005cf2f9dcc
font_01_sfnt_off000103bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BD 18204 bytes
SHA-256: 59e9a078f1c7376bae54d372a5763b0eab7e68a9de61f2a38a0634a59497bc2f
font_02_sfnt_off00013394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13394 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1