Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3d3de7a5d7a786b…

MALICIOUS

PDF

85.1 KB Created: 2021-09-07 19:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 06dd12755b11c3d5710078036bf7409c SHA-1: b77e00d20769e9a7471e4c0eb992fcf3c1d5db30 SHA-256: a3d3de7a5d7a786ba4bc3755c25cdb690068f18fb5cebd2f19fbbb0d8ea2736d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple potentially compromised websites, some of which host further PDF files. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to obscure the true malicious destination by using numerous disposable or compromised domains. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript for redirection or obfuscation.

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 http://firanywiktoria.pl/uploads/editor/file/kufosijigilanijel.pdf In PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/jq7efoam8m50tqbmvquq9mnh50/ridimawosikuwumogug.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b19c7544c19---kopidubetesitovibisojeko.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/56457075289.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/14352766366.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/kenefatidufonadibatebosut.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/javasekomekijojegufeta.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14e9e6ff22---wejudaruzeniwotenikezato.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/na0p1j1ctabmnhk45ro86l2rop/37310745067.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/fb183c1ea1acafda04721eaac1102944/bisilujujakeguzevam.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/zabimiru.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/5998095126.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/a4e572695db6538d182f333eb90a38a4/zaxixugepugalinewar.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/78117129528.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/nokudumuzudo.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/95709793678.pdfIn PDF document text
    • https://led7.ru/file/jawuvolugizoxujop.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/dubenepakodan.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/00946d23bd6205ea3888acc2dc9b1a31/ganazawesepuf.pdfIn PDF document text
    • http://padgettlawreunion.com/clients/79772/File/8511358879.pdfIn PDF document text
    • https://masukpt2.com/contents/files/jumijodegitumuxuzeriga.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/modedibixigaxoro.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/gexenetomo.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/32590556502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=make+adobe+pdf+text+searchablePDF 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_off0000e633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE633 18224 bytes
SHA-256: 4293a536ac77bbcfbf25cf4ae32ae7fe414cc143238514b5c4191ce48c8c95a1
font_01_sfnt_off00011574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11574 10848 bytes
SHA-256: 270152135d4cf730aa1ee0d5b996772d1580da09b06fd12342e7cb666156f588
font_02_sfnt_off00012e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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