Malicious PDF — malware analysis report

Static analysis result for SHA-256 04764e8df4de513e…

MALICIOUS

PDF

76.6 KB Created: 2021-09-02 00:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5c2fcb4077aec164a358772068e47b65 SHA-1: 5617664b9a8220055ff39b20f281bf436c2f038d SHA-256: 04764e8df4de513e71a623b6397295bdbc50041896ef06f319b90fcb448c1e9b
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, distributing links across numerous domains, many of which appear to be compromised or disposable. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests the document's purpose is to lead users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://bodegoncriollo.com/userfiles/file/42113772723.pdf In PDF document text
    • http://www.gonouvellezelande.com/files/gamelakitofubo.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/soxesagogotok.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160d34ba86cec8---67334354187.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a4b819caf---zusataru.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/438f7be4d60be957af401ea6ffbc29cf/laradonoxebu.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/ef80e646d91f8e17268efb67f409e5ea/37100421507.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073725b188c0---68937587890.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210728112448006.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a32ca4e98ae---nirozixozosovofovuxoloj.pdfIn PDF document text
    • http://iworking.vn/uploads/files/maminiwijemosoluv.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/wituzuwabetolif.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/kiketotuf.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/39658102111.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/70269233154.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/sanuxogav.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/xejavelujipivuxomibotef.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/liveparof.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bcebbb2df---96234327747.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/c5b595e31bf819c2155115764706a2da/84569563122.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611fe1592eca4---tikewupavinomenagarag.pdfIn PDF document text
    • https://fallsplat.se/file/tubuwanepon.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/35580625313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=spawn+cooked+meat+arkPDF 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_off0000c65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC65A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE71 10620 bytes
SHA-256: a84c9d63e740425c8d941d23f61ca32093bbe8143b4c1cd0b7e3517abb4325dc
font_02_sfnt_off0000f6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CB 17688 bytes
SHA-256: 5d2f33b1f715d7ae07d2a194c26f774873d1311bbf21df8c43a8b92d40febb23

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