Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d8667a5691819db…

MALICIOUS

PDF

62.9 KB Created: 2021-09-27 22:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: da0a584499480ccf331eb858937515f0 SHA-1: a2af66b1a0698a82d8940055f69c250605eaa0ba SHA-256: 3d8667a5691819db2ddaabf789478d3a30935eb3bf5cbc76bab1dad97e3fc047
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6359

Heuristics 5

  • 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
  • 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://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16146b3ff040e9---pekupiwejakuguvaweka.pdf In PDF document text
    • http://terralis.net/catalogue_dynamique/file/tokuwumenurowixup.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/26741161801.pdfIn PDF document text
    • https://norservis.info/files/files/fagekuwilinuzenabesek.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/zizexogimikofevajujuni.pdfIn PDF document text
    • http://fpole.ru/sadm_files/5065912748.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/24730475762.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/23657640958.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/gepedexunilumudim.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-21/20210921045404374020.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/bisapepojanesoloxiluli.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/69699740845.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/faligas.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/aed7fb14132bb1656345a42826d21257/42060817129.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/45949470457.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/zubogexewopakemugugik.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/76144276269.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/mepepeme.pdfIn PDF document text
    • https://techlan.pl/files/file/vegizarinikoxigo.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/wadikike.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdd89c0d62---90719957735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=clash+of+clans+wiki+queenPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB19F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B1 16988 bytes
SHA-256: f8c0e5e363ac60f2f0ea2104ae964a8bf159fe97825f69dfee790f586d35adc6

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