Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2da2b4e34823bb1…

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 23:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b93effa0777ebf39f16abaeadaf413ec SHA-1: d75bdb2c7744e916123b2537f534915bd88bdf00 SHA-256: d2da2b4e34823bb1a90ada79a32e68de1e6c0989230169262357f0315dec255e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.benkorner.nl/admin/library/ckfinder/userfiles/files/jiwimej.pdf In PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16147c379b031e---woferosupewiwetek.pdfIn PDF document text
    • http://metallpress.ru/files/fedegogoledaredaputoka.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/68573451914.pdfIn PDF document text
    • http://vntattoosupply.net/uploads/image/files/dotoruwotate.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144d11d6d1b5---57546927904.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/8da4bb3750a6ba7b69920484727329cb/33839444881.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/38879794391.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/dou7ep07mma1brp386jeleedr3/56250938684.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/83589546394.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109092332207633.pdfIn PDF document text
    • http://sial.pl/galeria/file/95861385059.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/486f62eb700f3b2403042c2993762b55/nusudupowodevawozeni.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/55177765927.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/lisali.pdfIn PDF document text
    • https://ksuskalology.com/images/file/15108466977.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161435ab34cffa---buxizif.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/712b79143bb1a025752c237aeed31855/rawizuximigomuvuvikozef.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/famelesigamitiwujodexedi.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/18459615163.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/lobibibilofitabuv.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/63703f123bd954f6abc281af54a48bf0/bukozudebutudaxagubumitov.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/53872217570.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/93957121738.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=pie+launcher+prime+apkPDF 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_off0000dcaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAA 18736 bytes
SHA-256: b9bfe2aa93da0d9d2b723abadddfe7ffdf48d4b13c2006457d8e2f6c8f0b0789
font_01_sfnt_off00010e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E08 10444 bytes
SHA-256: 6fac1b1898349a8f8d7c9932b8f56517d3cac89cf123e665e059c9093ec0dc58
font_02_sfnt_off0001256c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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