Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84ef28d17e1d5ee…

MALICIOUS

PDF

87.3 KB Created: 2021-06-30 06:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7474840bccf8a91e816a6867e9e15beb SHA-1: 46aa331dcbfd0c21f11b193d6c95ad4b1242e617 SHA-256: c84ef28d17e1d5ee6e4080f842d5fa08615ee93a25256ef490376ec2bd3e42a5
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 ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content. The document body is unreadable, but the heuristic findings strongly suggest a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://b-solutions.net/userfiles/file/1255349815.pdf In PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/a8475aab76b2a540ff6c7277030401d4/sipefa.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caf9f38afc8---25619412356.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/40730993466.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608749b3393c3---luvivuwumubo.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/1fea23114af3ab39a6e44a3f764cab40/radivowixa.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/43e0a2009977e8959a7ff73a225a5aee/58832040304.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/7b8917e369d5780db8abcc96e6260561/lutikuvogajowavewe.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f11b0419a---kovaloxipudopuwegosubive.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210616_270C74455C9B6592.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/belelexapulunexoxi.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/46688801038.pdfIn PDF document text
    • http://bakoca.hu/files/file/mekiporixip.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/rnlkkihcq82htvb4goh6st319m/52058336396.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/damirewawepulamo.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/jirululesawawovatopi.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/scldkentu4fdlgf95qp5v00sgd/gufaxidagilofavowakarap.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/viburobof.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072930004a21---dolilewunamixexegen.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/bf7a5b31dedd4c196dbd5b345880cead/jodud.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/974b6iur89ih0vuj0miokjbad2/zatet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=perforated+eardrum+babyPDF 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_off0000f5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A0 10460 bytes
SHA-256: a81e884ec10d226be0328f021c1547467fbf78311bba389ce0f2ab467938916b
font_01_sfnt_off00010d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D74 16492 bytes
SHA-256: 6622e86709f14ed160f418c75d70ac9387b8ad49dd4f308e13fb0ee8d25a7186
font_02_sfnt_off00013868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13868 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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