Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca38ca12ef446c9d…

MALICIOUS

PDF

72.7 KB Created: 2021-09-20 20:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2ba5c74f64b7a757e27b46eb313b922b SHA-1: 7328edddd1bd125f234038604624006bd0cdf332 SHA-256: ca38ca12ef446c9d81661e3ad49cc566283e68eccb23905228efbb435b2708ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, directing users to download other PDF files. The presence of ClamAV detection and ML classification strongly indicates malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the links are designed to attract users through search engines, leading them to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=bengithi+lizokuna+zulu+novel+pdf+free+download PDF link annotation
    • https://yapluka-services.fr/userfiles/file/16463431368.pdfIn PDF document text
    • http://didopack.com/files/wudoguvesom.pdfIn PDF document text
    • http://dmkert.hu/files/file/felinijoruzikediv.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/54435673225.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/60624738890.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/vunirafamenadu.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/18279631423.pdfIn PDF document text
    • http://immopolignano.lu/images/77039996931.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/96271431881.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16147b2a99cb59---waroroli.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161430a1232c91---gimusoja.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/45281135599.pdfIn PDF document text
    • http://gekon.net/userfiles/file/mizozerilafuzame.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/63258709696.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/79685269173.pdfIn PDF document text
    • http://okcashbagusa.com/uploads/files/ronikivodexakuraxoboza.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/161404fcb7b1c2---tupubawurilamekixexajalu.pdfIn PDF document text
    • http://agro-partner.com/Image/files/68865101384.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/64964648183.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/78026815685.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/53818603861.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/fetugibifinisabitubiva.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/94128395541.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210905050950.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_off0000baee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAEE 15652 bytes
SHA-256: 7150a98b7263fc41be672be4557d716693fdc32824cdf7f86cf4f0c9b0a6836c
font_01_sfnt_off0000e2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000faef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEF 11064 bytes
SHA-256: 25e78f4dfd55014c7b2c4ef861fe6225ba5ea8c99d74e151e0dcd36c1cada261

Open this report in the interactive analyzer, or submit your own file for analysis.