Malicious PDF — malware analysis report

Static analysis result for SHA-256 bde540f61d0a6bc3…

MALICIOUS

PDF

72.3 KB Created: 2021-08-29 18:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1ea58e856f2d1b1c9e615550ef63fb3f SHA-1: 89c36781bd004e0e48bc57e8595523c274e77b8c SHA-256: bde540f61d0a6bc3a80888c1148d4cef5ec1dd3a967ab15fef6ac9341f479060
156 Risk Score

Malware Insights

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

The sample was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The PDF document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's a container for malicious links rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cambodiadriverservice.com/userfiles/file/78000562948.pdf In PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/7cf876f1c1119ddc760867865b600cfc/50562498952.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082331612e3e---45582957875.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/kopejefu.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/23338783196.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/73041385989.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/d2e97237645bce66d632a18ee214935e/22994163148.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/2307356237.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bec0d867d---dagugolul.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc955620d1---videsorovinu.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071faaa4935e---jakorufomuxupugadebe.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/33770221026.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/82457962255.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210804_010237.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/petinafo.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/47432312584.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/68868497155.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16080b1734d45a---sisalez.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/50070132135.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/76ac622fcc039d0050b5a1470a52a657/gotazesipodorobu.pdfIn PDF document text
    • http://bananamusic.tw/uploads//files/202107310806472931.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/2v84a05s4gpo2fjpkifu1u1vt1/70566215970.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/senuxebotosum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pipeline+operations+manualPDF 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_off0000be71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD688 10512 bytes
SHA-256: 4ec64515c2b5026182a5d3169a8b8ef37c7ec445af514ae882d131f6afcd9c11
font_02_sfnt_off0000ee65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE65 14748 bytes
SHA-256: 6da6a002186e5c5536ee32e24b2cb1728e4a39a9849e526bb544365500ac4e31

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