Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea9f5a160a59a3ba…

MALICIOUS

PDF

72.2 KB Created: 2021-09-16 18:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a1f5f15ba2e9ffb169afdb1a60686ca0 SHA-1: 3d7c635814ab96a1b7785c2b634d6c98d70648a2 SHA-256: ea9f5a160a59a3bace6f373eccd5963c47376a54cfc812cfd9374e439dffcb6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous URLs, including those with 'utm_term' parameters suggesting tracking, points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=open+your+phone+companion+link+to+windows PDF link annotation
    • https://cordovajewelry.com/images/file/gakidodorabobalurewigato.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/kujajamivapewupugifutafo.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137355a22d81---jagoga.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/wunofujuzofejozuvopadok.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/94860397697.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/difikovadepewipaxijelunu.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/333300701c198a2f496da6bc3b80ae47/ponaxelibabutixirajo.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/todexigekemutirazepinuxef.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/21021751048.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6b490c16d---zebosowororizaxaf.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/93772308051.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/zukiwuvosa.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/53027751534.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/45399029977.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/2087062136.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/mafek.pdfIn PDF document text
    • https://sambelteri.com/contents/files/39116501696.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/44546641527.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/85366673084.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/50483039590.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/9bfe045a284c7f0976359f310cf99b5e/61078326989.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210901052622652427jpe94o.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/4767864881.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/8a958ea7690b7681ad06b009b2616372/20695849586.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_off0000b3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AE 11196 bytes
SHA-256: 4aa3aa697a831aaae7866a08cc0692c2be8248e93e2521284c7641e756a0c6dc
font_01_sfnt_off0000cdc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC5 17592 bytes
SHA-256: c1369186b1e33157a84c0db07dca9d7a7fefc956a1b4c163c61aed306c9654f0
font_02_sfnt_off0000faee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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