Malicious PDF — malware analysis report

Static analysis result for SHA-256 95543c59548e1328…

MALICIOUS

PDF

86.5 KB Created: 2021-09-06 17:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 93347adbcc7ff12e780996e980070b23 SHA-1: bf7781d0c9160f84ba35550f4f7b1dbfb84bfa46 SHA-256: 95543c59548e13281f7136c2676bd5425e3c97e735cc8c9121a69401df259116
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure suggests it's designed to lure users into clicking links that likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16094296e7dddc---juvuged.pdf In PDF document text
    • https://resttour.com/images/userfiles/files/53405799825.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/zivubor.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/78207922649.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160de4c58bcb12---lavebasutadekem.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/44932210702.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df4097dc7b0---54392839479.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38711636435.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/zipefujezepoboligufabenun.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/e898728d54be627c54f6d26ddf17547a/bimadixifa.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c0f5d99c7f25bdecead1168ce27188cc/35090295421.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e3fa6064048---84255951459.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/37329008240.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/19349311193.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/6c6603d9f895916c35404e764b1e266b/20673110758.pdfIn PDF document text
    • http://huiking.cn/uploads/file/211625202013.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/54pgqf4n908rr222ok2ne1fvvb/10341360883.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098455bc174b---11120495333.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/89759486120.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/31023212442.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/61458131081.pdfIn PDF document text
    • http://asfalon.com/__files/file/zaropuzojotagediduvumoku.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/71582642191.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/nawasak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=soal+un+biologi+sma+2016+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_off0000eada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADA 11288 bytes
SHA-256: 546cb2601b48a95e3d6fc49cdec3072c22c9257442afa5c14d65a0690b96246a
font_01_sfnt_off000104e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E6 18084 bytes
SHA-256: 4f6d495d388551c8ecd14f8e68a44793d7f85a84d4a72502547b1b4d372cbe9a
font_02_sfnt_off0001343e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1343E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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