Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaf44df768d3474c…

MALICIOUS

PDF

84.8 KB Created: 2021-08-15 18:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9c9e931f481a508fde42b5131dc26333 SHA-1: 80eb3d6b35ce8171029f42b9fde6fd05c5c752d0 SHA-256: eaf44df768d3474c3e3b735f5797df90305f68d9825384b0a6b230f2534ce4aa
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to further malicious content or phishing pages, indicating a phishing or credential harvesting campaign.

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://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/d05bc31a0cf2dff23107d1440aec628a/nivupebawoxepuz.pdf In PDF document text
    • http://cokhibaosang.com/media/ftp/file/3660626877.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161008bc27ac07---91473706546.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/64432455407.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/85791527912.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/tupexubowobiwa.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/nuwozub.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7f2bbd3db---40997724348.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/b2320d8930ee495447a756c5439ef6bf/buvoromekaset.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/82286003393.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/38774280250.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/40910645452.pdfIn PDF document text
    • http://gyobel.itpublic/file/88964608625.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/tasakajig.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/9lruvau6mspvhpef5abguj27kl/wegefitixuf.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b273f346228---lezural.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161132d7bd1259---pefejis.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721cf8b561d---23479625595.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/98475672467.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/nokipidorob.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/todizitasevatowowinaw.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e52ab3544---10695074366.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079dfc01c574---84349522170.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/44105723159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=ejercicios+de+circuitos+electronicos+resueltosPDF 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_off0000e189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE189 10412 bytes
SHA-256: 958cc8aa1910406f6689b408d963bd8c9e35e10f891e4289bf616796ba05e586
font_01_sfnt_off0000f92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92A 19008 bytes
SHA-256: 6752741ea7b7e04cedd566223b481bc5496460f8cd77112b707401b2386f21a0
font_02_sfnt_off00012a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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