Malicious PDF — malware analysis report

Static analysis result for SHA-256 8775b92c285e743f…

MALICIOUS

PDF

68.4 KB Created: 2021-09-24 20:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bfffeb495cf213036de6a4ec7224972c SHA-1: 1511f9694f7f7bc9028831489620c27501ba5ef9 SHA-256: 8775b92c285e743fbb0724ff2d8c02aea0c0560604f47aefb50dee2b7d3d94bf
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a link farm pointing to numerous domains, many of which are hosted on disposable infrastructure or appear to be compromised CMS uploads. The primary purpose appears to be directing users to external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://energywork.pl/userfiles/file/pudubakok.pdf In PDF document text
    • https://charming-dc.com/uploads/files/202109031247351575.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/161467e92e0644---14087041967.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/wodunuvirujufiluradi.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/63624083508.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/nuriromasamitid.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/22334204931.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/tisunakoxamodixadujosi.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/78032156193.pdfIn PDF document text
    • http://coolscape.info/images/files/japegaruvavej.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/vasuzagu.pdfIn PDF document text
    • http://secoinblock.com/upload/files/28980427596.pdfIn PDF document text
    • https://clickbox.ro/images/file/3819395645.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/45206312372.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/1609881441.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/nuvomejagenedekiv.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/rowarigokugabe.pdfIn PDF document text
    • https://cncunse.com/d/files/25420409929.pdfIn PDF document text
    • http://findusafranchise.com/files/files/gixakotiwuz.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/70df5dd23cffc20e6c56e9ee605f9f5a/88476568972.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/joxiwamuderuva.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210906_FD3CC3FAFE8260B5.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/1kc4k5m61hgkrmc2v6pl6o3mpc/redapopis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=modded+rpg+games+apkPDF 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_off0000ad95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD95 15340 bytes
SHA-256: ae348318336f39b7c6d97b254da03baef56459df835a07159ef1ced7bd524825
font_01_sfnt_off0000d4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B9 10480 bytes
SHA-256: 4c8ad3cc9741be239f7305743b2d01ce951af10563e3c42100260937a3adca40
font_02_sfnt_off0000ec58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1