Malicious PDF — malware analysis report

Static analysis result for SHA-256 4919f526a4922853…

MALICIOUS

PDF

68.7 KB Created: 2021-09-20 05:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 790a3328eb212b842e88832dfd4d47fb SHA-1: e3037e133408a01cc69e1afefc549e038b10ebb0 SHA-256: 4919f526a492285311ee78737a176ea693e7afbc1ed6c28595adef5c7c91bea8
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO poisoning campaign. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links strongly implies an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://birutelorasin.com/contents/files/84407235224.pdf In PDF document text
    • http://alvit-bk.ru/userfiles/file/68118253253.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/lavekejasowedomi.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/vevefevuwukixami.pdfIn PDF document text
    • https://nomortiga.com/contents/files/sigutavil.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/zamokidikaxunorenazerelum.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/rudojedexebesokiz.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/39899425758.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/vejazifuwatofi.pdfIn PDF document text
    • https://palet-school.com/files/files/50805558802.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/13069420703.pdfIn PDF document text
    • http://www.bandungmesin.com/file/wozawazelenufa.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/xasisimokiwakozimoza.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/giwisorid.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/58290579675.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416a7600747---venekaxa.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16134154342aee---poxidet.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba8aeb1407---71700796414.pdfIn PDF document text
    • http://stringladies.cz/userfiles/60395155456.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/sidimigipanokemo.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/perix.pdfIn PDF document text
    • https://limsurempat.com/contents/files/25348807888.pdfIn PDF document text
    • https://mashura.co/userfiles/files/4215086638.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=sniper+3d+unlimited+coins+and+diamonds+mod+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_off0000ade1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F8 11112 bytes
SHA-256: 5bf5fa67434c2e9f673638c48ec813156815ea5b0d366565038e0d3e871b8bac
font_02_sfnt_off0000dfe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE5 14776 bytes
SHA-256: a6ea4d12cbdcec5cb30887884fc827eaf27890096f42433b73835937d4220d4e

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