Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c0840f2f09f415…

MALICIOUS

PDF

79.3 KB Created: 2021-07-26 03:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ac4869eb05cb2c4a97efc4811caee94c SHA-1: 4c8d66d63949b68b63de1f3fb37ede7fbada0837 SHA-256: 76c0840f2f09f415531bb4fa0daab85dfc460b11609832a3dc91ee7db725cdb7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://liniagdanskzydowo.pl/files/dosafipuwokarajote.pdf In PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/4091b81fa973662d938c3809af00bff9/49957327249.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/529a7a46f17d7b3ec7aa6d311e3cfcf4/vufudenudi.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/39419006429.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/88754523176.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e859be1b---varuzalovipamu.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/33846410520.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c772d01cee2---midurepizapimozemozu.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/79151799936.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a883547e47d---zejadarelarijasikiza.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/45854953685.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/53j8ml6a7gaule0i7b6kj43l2u/murakigigukuzope.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/eb5e958c437786bc7bee30a023ac3f98/bolawenezaponela.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/sp115mur9jrbd1c8ri0plo7rdt/rofijopebisubaxasobefelu.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/90688065070.pdfIn PDF document text
    • https://www.natursany.com//ckfinder/userfiles/files/xumugejumutiz.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/pafutagowetozosaf.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fee5a42418---93719831486.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607555ea7f605---76627035559.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c65f1cc18f---gamutudokupo.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a02e1b2bf8d---fuvep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=this+time+lucky+in+game+lucky+in+love+%E0%B9%80%E0%B8%A5%E0%B9%88%E0%B8%A1+2+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_off0000ceb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CE 11420 bytes
SHA-256: 996486a7a4952fb60dec74d2ea5a80b4ff12e23a0cdf026430185d87e82ebe0b
font_02_sfnt_off00010183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10183 16248 bytes
SHA-256: 414e103ccb33718d3b17b4a4810c1243bd425e7b2dfff14ed0efc0cc0da61879

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