Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcde5a240b0b69ed…

MALICIOUS

PDF

86.6 KB Created: 2021-06-27 09:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 07c52aa4bcbe7ca14afabc2261fe9c21 SHA-1: 0192302b2d09902be81dcad9eaa6a9c685d78207 SHA-256: fcde5a240b0b69edd1dd2de4debe66b76ad1bb4c3703b0d35cd03cb0a65e609b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, a technique often used for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links on disposable or compromised hosting further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc24f64ce17---savuwapukozajuwirikep.pdf In PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac7b918247---lewepepudegoneminepuvutu.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/22623457163.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/06/19/file/20210619_112229_167.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bcb550897---43153732961.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb2f9067f5---29461122204.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3118889da6---gupujokadawusanegijajezu.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/f17370b115591bfda51e8ed27968d506/xumudasume.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5a391909b---rorobibe.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/r26cgpbaqccoih4mc7bvg1mmof/27899894668.pdfIn PDF document text
    • https://ebooksweb.net/files/file/jarojepazedapumagobomosaz.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/47592447803.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/7505b7fe4a5f60f450f72db6b22e7532/59984942473.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/zosinekemu.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/986543923.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16083ca16b82ba---44647824911.pdfIn PDF document text
    • http://maxkbm.com/clients/2/28/28fcaa936e2ecbeb6c9a97ea0f1ab253/File/tozerixunoxogelodedijim.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/galivewon.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/519spreobd7q478k0mvl26jjf4/nivufezawupegepewodif.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/6549e45299dad100229044002d9b3b3d/budoroxiribemidagiloj.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/81079378330.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=famous+love+stories+in+literaturePDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/c0c331f8e15261d59bb023fecac80f38/92249871724.pdfIn PDF document text
    • 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_off0000f241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF241 16816 bytes
SHA-256: d167eee0ee975eebc877a9ccfc8f8a62676c400e71666c646700acf94016524a
font_01_sfnt_off00011d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D95 10412 bytes
SHA-256: 60c3734b7a3b9ae31ce7cb04ace07eb776d55638c426602754b6537c2bd8ec6f
font_02_sfnt_off00013533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13533 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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