Malicious PDF — malware analysis report

Static analysis result for SHA-256 04bee952f71bb770…

MALICIOUS

PDF

94.7 KB Created: 2021-08-08 09:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 28ae95838bda5f1aa7e584cd6e3871c4 SHA-1: f1d42d67f941682bdc49d223e418ebfffb83e0ba SHA-256: 04bee952f71bb7704e2ad3d1684416066debf742d33b8f4574dd01c75321bb47
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to other PDF files hosted on various websites, many of which appear to be compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF link farms on disposable or compromised hosting suggests a coordinated effort to manipulate search results or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tenshinorchids.com/FCKeditor_upload/file/zogekugelorixutojupaje.pdf In PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec3c14b7d2---suzejoxasojobebi.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/galarawijapasopize.pdfIn PDF document text
    • http://valaptop.com/ImagesVA/file/57173225951.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/gukedotirikanasadeno.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e58798816cf---82104782409.pdfIn PDF document text
    • https://lemanssrl.it/file/28773493349.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/ad10bfc96d24a3feea1b71e67eaa0a32/rovibopapetajulo.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/u5gccvnjhtun10bqd532a5m1ub/gumasekupusojav.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/89763472681.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/al8r1ha5dobjtnvkthjqeoutag/82717935484.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/80448712222.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/lusorigawebabosu.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/busojumogum.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/8047a550cd517c824e6a923c5e753026/liwifujazejame.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/98942048382.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f457e4d0ca---57023725285.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/10428911520.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/rudul.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26f6b0a00c---4474082761.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/5ig1npjkjj7uqcrfcqc7035bb0/18223355577.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/nokefepovi.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c725640ca4---65857724947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=nintendo+switch+mario+party+game+boardsPDF 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_off00010b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12348 11232 bytes
SHA-256: edddbf79e26ad1638fd46d62a2446d96b7d637998f113cebbd8e06673082ec5c
font_02_sfnt_off00013d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D11 17572 bytes
SHA-256: e0499b3024c79d6f5df1b077abd741776f03585f5da2bfa4271855df6f896802

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