Malicious PDF — malware analysis report

Static analysis result for SHA-256 7117c43c464cec35…

MALICIOUS

PDF

90.0 KB Created: 2021-07-30 06:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f66120d8053e959a34e2ca0a509f1537 SHA-1: b3fb59289778a18839a41a5005355a313ffa88bb SHA-256: 7117c43c464cec352621d77d9c7f9a607a7c7940e29d43473fc63f6b53f7889e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious or phishing content hosted on these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://drafthe.ru/uplcv?utm_term=how+to+force+defrost+a+samsung+refrigerator PDF link annotation
    • http://sacmacbook.net/userfiles/file/lofenabudamanurited.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/25008755013.pdfIn PDF document text
    • http://mfahk.com/upload/files/54265567792.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/depotelamax.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606efcefcd09a---46993449278.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087344f345c0---25421067254.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/xemufig.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/resoriduridexubujozenuwe.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffc7f0c081---xunelukogigosuwikox.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/59467280591.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/70610404442.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/pijusonefumepezok.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/rokifusebuwivepakij.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/mvvs3k7r99g1vnvn80h099opha/50671766724.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/fitelud.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/459de13afb8cbf0424d643df3a8398d4/mukure.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/vipevajover.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d99c550670a---bafoduvaselejopenaputu.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/sizaka.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/55942682130.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/f2237be96aa3929caa96ea3ce4a64130/28939831401.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b9758800692---vilitaliguxiwinuwimal.pdfIn PDF document text
    • 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_off0000fb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0E 10952 bytes
SHA-256: a43f88cb7cbf05ca6bc24ec3df503604102f068293ce5ef0fb8325e91c7d783c
font_01_sfnt_off0001144c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5E 17288 bytes
SHA-256: 3f88e15ad9d6b38fa347012990c8bb879f675c60411504df4c2b0cf22216876d

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