Malicious PDF — malware analysis report

Static analysis result for SHA-256 3460b8c259cdc97c…

MALICIOUS

PDF

75.2 KB Created: 2021-08-09 19:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ce80959de093c5e5812a4548a74a9152 SHA-1: db00098667c1900e873d011c8002fc3b02d3779a SHA-256: 3460b8c259cdc97c94daeb2332aa98993a8afd93009cf7dcde6f657d9fd62d91
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous URLs, many of which point to compromised CMS upload directories, forming a link farm. This suggests the PDF is designed to lure users through these links, potentially leading to further compromise or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16081e28747181---kefanaxo.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608562aa883f6---98063233398.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4871291fb---gegasewuji.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/87720667764.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/78409190080.pdfIn PDF document text
    • https://dprkoreatour.com/uploads/files/kukutola.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/94058654777.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///65665109389.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba3e4f0caf---zuvinubotarafiwojute.pdfIn PDF document text
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/96316782990.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c00d1e053cf---jexopukuputumifikopejuner.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/be0abdbb6d8c0d00e53157f50cc1152e/waxiladetuvebamikufofuw.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/dapevele.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160835ea16cc64---78899019128.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae3b42afab---25635853792.pdfIn PDF document text
    • https://toocapen.com/files/29306763694.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/texegavozigefomakun.pdfIn PDF document text
    • https://metal-et-verre.ch/ckfinder/userfiles/files/35989080135.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0166f43770---69925109326.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/mosagufolojiriw.pdfIn PDF document text
    • https://t2sc.me/userfiles/wejevonefitenibekojiva.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/mowobifima.pdfIn PDF document text
    • https://cape-electronics.com/media/file/19381969993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+find+the+perimeter+of+semicirclePDF 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_off0000c17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC17A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD991 10800 bytes
SHA-256: 2250079725daa51a76cab3ee5b324b9abbfe023913e5f00c39eaf093639b2705
font_02_sfnt_off0000f232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF232 16704 bytes
SHA-256: cf2776da0e7dbf3da3adf9e3f02e0f5145ab33a654fed46fbfbcb998b890935e

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