Malicious PDF — malware analysis report

Static analysis result for SHA-256 988eb9b044b2989e…

MALICIOUS

PDF

75.1 KB Created: 2021-09-06 09:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c98e7444323d506b750e41874bafa186 SHA-1: 75ed2c7bb7a12849a75ea57ff01192a257ee7a21 SHA-256: 988eb9b044b2989e5a0db59110264805860a138fc885965e1b68ef4bd412ea05
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many pointing to domains associated with link farms or compromised CMS uploads. While no scripts were extracted, the structure and URL patterns suggest an intent to lure users to external sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://centralgiving.com/media/userfiles/file/funawerasawo.pdf In PDF document text
    • http://huiking.cn/uploads/file/052008102780.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/29492853668.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/xuponudaz.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/lipobajixanoju.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/seronijuji.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/9316761768.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b0378eba328---93197074519.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/flig246c9k0kopjn9m0c2okcl6/98324058053.pdfIn PDF document text
    • http://woorymart.com/userData/board/file/xexojomumavijo.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/50998897302.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/24585903883.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160807dde575fb---didut.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/6f7c471b9d1ac0f4daaac208998523a3/sazegadagexaxiweja.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/xetuwotituxiwowobisozije.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/paxisibiwutu.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/anpgmiv1n3rgb8knggi37mc6dh/50535427064.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/kosusatusub.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/89048360484.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/fafepesew.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/75738627210.pdfIn PDF document text
    • https://hse.tw/upload/file/52012772747.pdfIn PDF document text
    • https://yalcinplayer.com/calisma2/files/uploads/23451220934.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160840cb68ab78---26745551528.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/95714038990.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=probability+set+notation+worksheetPDF 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_off0000be8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE8E 10636 bytes
SHA-256: 7caecf174ebf5df9ed0c35e874b5445ab9c04065240a9ff3191c7584fc14149b
font_01_sfnt_off0000d6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eeff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFF 18436 bytes
SHA-256: 34be16edfa7672846cf15db2c13bd8d9c5e2921099431a184dc00ae3b74f8f1e

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