Malicious PDF — malware analysis report

Static analysis result for SHA-256 135669d9b48e8432…

MALICIOUS

PDF

76.9 KB Created: 2021-09-19 17:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3823fd917fe1249e672e4fe07187de9 SHA-1: 939ce82863b16e61a6ea7d238f440f2ccd902605 SHA-256: 135669d9b48e8432dca50acb778310e7c0bb4ddcb5cfc2d09923fbc7385a9ee5
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. The presence of these links points towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/fa45b919d19672c05929a09b4ced0164/molakefob.pdf
    • https://mariapolis.net/ckfinder/userfiles/files/13165699647.pdf
    • http://ecohort.com/userfiles/files/vozeser.pdf
    • https://tefen67.com/userfiles/files/nidefisogojudopopizubep.pdf
    • http://atek-ent.com/upload/file/revokebisaxiguf.pdf
    • http://gidromall.ru/img/uploads/file/dolupisubinagus.pdf
    • https://brillimet.com/uploads/files/202109121456053818.pdf
    • https://ciela13.leaddeehub.com/userfiles/files/19879044532.pdf
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/pajufozejivitu.pdf
    • https://avflash.nl/upload/files/62825383085.pdf
    • http://f-okinawa.com/img/tmp/files/masobanukagaxofoforepele.pdf
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/11671265494.pdf
    • http://incomingmakedonia.com/files/files/pigezikobumulobuva.pdf
    • https://tvmreza.tv/ckfinder/userfiles/files/melazifafuxovoji.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a47e3194f---xegufuxexanunekunodo.pdf
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/75960058629.pdf
    • http://ph-easycome.com/userfiles/file/kajamaleloxuxepomevawa.pdf
    • https://rajatotogroup3.com/contents/files/17030466697.pdf
    • https://ykitraders.com/UserFiles/file/73132975060.pdf
    • https://bahamianbrewery.com/ckfinder/userfiles/files/19533681938.pdf
    • http://itineraire-consulting.com/ckfinder/userfiles/files/rivedukinomo.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e4534eb1b---fetoxuduxozakunojomiv.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140039e1c770---vaxinixilewuvuxigasumuf.pdf
    • http://laiyi-art.com/userfiles/file/4237705973.pdf
    • http://blfimmobiliare.com/userfiles/files/vakilil.pdf
    • http://frankifoto.com/uploads/pages/files/sibadefilu.pdf
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/muwuzejepevamukogatuxog.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135779d133af---67156103421.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=samsung+galaxy+s20+fe+vs+iphone+xs+max
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c67d.bin
482fc578558713c79020b221f15ebfc46bdf0c40824e5fa2fe84ad5e8c13dfd6
pdf-font-stream PDF embedded font (sfnt) at offset 0xC67D 17128 bytes
font_01_sfnt_off0000f303.bin
982a10f55a22da765f1966685854da861417135c856f800af943347ae35f7c6e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF303 11304 bytes
font_02_sfnt_off00010d70.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D70 16792 bytes