Malicious PDF — malware analysis report

Static analysis result for SHA-256 5232301f418697b9…

MALICIOUS

PDF

87.6 KB Created: 2021-08-31 20:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8b358207d4b060c4705ebb3be7bd2613 SHA-1: ff84ba0005628f45ebd5150505e07e91f1f9f1dc SHA-256: 5232301f418697b974096b37d6f55abf79d4283d46af8e6a7b24e83327621e70
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cafa122f1e930bcd6707a241919e56a9/80551507148.pdf In PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/53573219462.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/125f012fc008c57a3e388618bd249ae0/saligufafedabomivotoj.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ce6b01af4---43727598750.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/roxamanawixaberafosudo.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/16903332667.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/35830317394.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/ioitosdm4kkubp1bqjahp7da74/wiwelabedera.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119ff827c99b---81086465917.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bfc147d5e---85698713659.pdfIn PDF document text
    • http://musicupclose.com/clients/f/f7/f7c291dfb329fbc33054893077acf627/File/23070404266.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/vubepoxor.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/cf20f4a7d5ecb54a81bb22cec5dcfe02/9404802947.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909cc0c6a24---nejijopuwivigel.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/99262093774.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/vitilade.pdfIn PDF document text
    • http://glastergroup.ru/userfiles/file/99983790789.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/kiwowijani.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/10792049482.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/15379966980.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/36e1f292e7e6cb33358f8ebd92f0760c/pugurovubogukeke.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/64af7dcc0b07b7ddff020b51148b0048/40047394767.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/9827062856.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/53dffcacfcc7cdf7a6923e12c0586635/lixewasubev.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070749a249bb---89863292090.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078455083660---gakopugik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+make+conversation+with+someone+you+just+metPDF 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_off0000f1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FB 11028 bytes
SHA-256: 7d745df0f047fbaad5c64d64f5ae5cb925e49e23bcbbeef2246931e8cb52979f
font_02_sfnt_off00012371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12371 17192 bytes
SHA-256: fb7148634d6803fa497fa769301083888e7a50d5e78b201e404a6a5f719efe22

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