Malicious PDF — malware analysis report

Static analysis result for SHA-256 d746728538e3ef3d…

MALICIOUS

PDF

82.5 KB Created: 2021-09-05 01:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7660db815feef84eb43e5154cb741818 SHA-1: 544367c962614b3231e40b1f0c36d775288a63b1 SHA-256: d746728538e3ef3d2ac68b807bd656301f8a8e0c31ca6ff2a89e56f9fb69b752
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The presence of embedded URLs and the nature of the heuristics strongly indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ahdongjiu.com/upload_fck/file/2021-4-30/20210430100314613942.pdf In PDF document text
    • http://hujiangsy.com/upload/files/sobivonadamutovo.pdfIn PDF document text
    • http://nhs1966reunion.com/clients/1/1c/1ca8f1639ee69cd7806809ed3bcda9bb/File/94719658286.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/detowes.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096002045187---nudaguvebewogebolanepa.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160870e7d5ba7c---latenadojukoluzibiz.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/wekale.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/46145902470.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/8953225132.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d565ca19630---64151031112.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/bj4j4kig3b3fh71g0ume60f1ps/7351852733.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c842e130f0---rodameriribopalivu.pdfIn PDF document text
    • http://intergeored.com/upload/File/teseruru.pdfIn PDF document text
    • http://smn69.com/clients/866038/File/pupezexotu.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210519045456758.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/sepup.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160ade927398fb---vulijigozufupitabo.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/37954831844.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/0319682783f13649c86092ac74c23502/jibomewi.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/647b27c3793ccacbf11f95413856685b/lawik.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/difafezet.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/sixodu.pdfIn PDF document text
    • https://defi128.com/userfiles/files/61119620500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ps+i+like+you+kasie+west+pdf+espa%C3%B1olPDF 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_off0000d817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD817 18964 bytes
SHA-256: 6c55c21901df233897bd502fc75c910bde6aa61079cf0cc7acb4e14a7405cc14
font_01_sfnt_off000108ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AC 10888 bytes
SHA-256: b525d4513b1882923a85bf7cf67fb802578042039cfaf13d7dc0fb56a3837d5b
font_02_sfnt_off00012215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12215 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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