Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d2c4e6bbc9ce1eb…

MALICIOUS

PDF

77.6 KB Created: 2021-09-13 09:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 66f0c808b96ac848039bd8164620e072 SHA-1: d0a2aea4742a91c9ed3b9c2cc98f475271c93749 SHA-256: 1d2c4e6bbc9ce1eb88b483bd7fb5a2ba4705361a55700c837c6112f190b79a15
156 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ghinelliarchitettura.it/userfiles/files/76760944683.pdf In PDF document text
    • http://romengo.com/ckfinder/userfiles/files/91508010382.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/76f095ba682c896ba824a79c41b99bd2/getesujawasotowiwafanuxe.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/pqdmn2sj83pfo1cevqm1m873d9/magepabovinalim.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/xolesozadofexujo.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202109121424202396.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/11345836196.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/72764478969.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/fesolodolenobatavux.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/zaloromeluxemabazozo.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/80101415795.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/55067215781.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acf8930a81---nigakirafe.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/16078848677.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/kegefewaboj.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/belosevibuma.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89798371449.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/getowizidodiniban.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/76140573062.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/galijudajofalufor.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337ebf2c70e---sodefajexoluwapiwolinazo.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/jevixirimimi.pdfIn PDF document text
    • https://loyd.rs/images/file/nefap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+boot+mac+into+recoveryPDF 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_off0000ce83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE695 16600 bytes
SHA-256: 4ab0236c080e62688ea9d713e49f050f058e984f070b3e2c4c9cbc1ca74e6f6b
font_02_sfnt_off00011136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11136 10576 bytes
SHA-256: 8c5536fe3b51c755278ae7b2bd8c78c3ffa65deeb042b98677c1c2a16424439e