Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2d56c7cd6bc4230…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 14:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: a4345912db8642110906a73d3b7f3fea SHA-1: 689babce75338edfb7386ac1f42daa6fe93e630f SHA-256: d2d56c7cd6bc4230eeef0edc019c68b783eec93e8b35597ca55a4d8f1131d2fb
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress uploads and other domains. The primary purpose appears to be directing users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bc21dc57f---belopif.pdf In PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/95527667085.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/fifevaxemi.pdfIn PDF document text
    • http://azs-szermierka.pl/zdjecia/fck/file/56809301693.pdfIn PDF document text
    • http://haki.vn/uploads/files/34044717096.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/27992998219.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/pedivegezumesebefaka.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/60790427494.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/58731388611.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/lakupekat.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/lomazamaladapozisidax.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d70674e48c86eaea580efde3af56788a/bapazofejolusasefado.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613944e1755d4---14644084123.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/52441260229.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/gofuti.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/e6d070dd1e79c01ffd96593a63e7b4eb/9607136336.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/41414837205.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16141d9bba23a6---mimefibutuzuzin.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/texoful.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/rivikejim.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/wogananin.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/46637960869.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+record+voice+in+android+phonePDF 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_off0000ddb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB8 17152 bytes
SHA-256: 8161f047bf58ef54e8bf2ded9f939a5e04975e7642b4c4e34a91a6916cde4f48
font_01_sfnt_off00010a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A28 10540 bytes
SHA-256: 311655a5cf376b94f32090641e2fca03729dced0753d1449500c1d08e8b74e65
font_02_sfnt_off0001221a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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