Malicious PDF — malware analysis report

Static analysis result for SHA-256 b68154f922564436…

MALICIOUS

PDF

75.1 KB Created: 2021-09-05 02:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7ecabdaddeecf84d499735b7af29fb21 SHA-1: 75ea5ff3e8d2fe0b9a3628038ebcc3d42a4ad58e SHA-256: b68154f922564436291485bec7be962f646f1e3967e2900b7aededc622a65789
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of these links and the overall structure indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

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 http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c29f44225d---jenoko.pdf In PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/6b34de55e0cba36eb543c553445b3f34/59548589433.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad67ba089a0---xukufese.pdfIn PDF document text
    • https://socardan.com/userfiles/files/muxogesudazizotatujazuji.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/0927f312dceb0c9c7033c059096cc603/49207851748.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/a0e468eb569918fff4a9abdc0e620211/rokajutobup.pdfIn PDF document text
    • https://arerp.kr/data/file///nowukisut.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/57950135965.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/97476953659.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56c8e8d0b3---wamilejedogopet.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be050a3a34---butuwuwururodamilozilo.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/25310723804.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ri84sggei9bn1b9sb87toflg92/fafukuwolulixo.pdfIn PDF document text
    • http://katela.net/userData/board/file/wulexakelopipulexiva.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/80234748260.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/62518724309.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210726005135.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/b7c1e0c0f67f3f75f09624012f3f3919/15790075807.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/9c5e75baa23696bee73927890b00c797/dutevojew.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/9579af82e4cb89c961140aca52c57cab/67929866278.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/aaac012fafa6e76197038a93d861dabe/7714266041.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/20501ca0ccda3b2570edf2eef57124fc/tuzejilejidotima.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/16349426829.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/darelubipubidomejokojut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=canticorum+jubilo+pdfPDF 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_off0000be7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE7C 10884 bytes
SHA-256: 0ba614ada4893ff6bb1a45f11da834d9ea256632aa62f4cabf118bb620aa6caa
font_01_sfnt_off0000d767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD767 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF79 18276 bytes
SHA-256: d7b050358e9174c2844e0a18929f3f59289a48e5aef4a8615250a79ddd8bc9e3

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