Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f3e3be8ea5d73f2…

MALICIOUS

PDF

78.7 KB Created: 2021-08-01 03:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9f5799c5d1b74b2b273d0915194ec775 SHA-1: b2d63080b46c13116665fb2f70a49941d02c53aa SHA-256: 9f3e3be8ea5d73f23a743f6db4885aca1f70f7d5146a6a37b436a0828504d11c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites acting as hosting for other PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. The presence of multiple links on disposable hosting and compromised CMS uploads suggests a link farm designed for SEO manipulation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/5dd5874bcf31f0bce6cf07827393d5e0/jagulenonikodujo.pdf In PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9fb0338d2---lujupugave.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0ab75bd58---37173357498.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/welajukubalo.pdfIn PDF document text
    • http://air-ned.com/uploads/files/89374996737.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/nasomolowin.pdfIn PDF document text
    • http://gpn1971.org/clients/a/a2/a25689677492d603657f1241a2a69ea8/File/46717128650.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f2b77f792fc---47556911500.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/mq7ptnvmk31u5frgokn4hjq8v7/30655136111.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/96581654460c682d11d4de.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/42c2e1e3052daf4bed313d1b6567ef8d/9471780447.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/xitovonirifarawesar.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/0cf99277788939b34022adc3b665526c/soluxepupebed.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/gowalamizizonenanevab.pdfIn PDF document text
    • http://chieucoingason.vn/files/51750330271.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021061012264540.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/dezakojowejopi.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/9848871f6eca9a834f3b80955e10564d/vusujikotiwem.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/5ebd84b59c4b46656fdbee1c45525340/fajajukogezi.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/522c2dde673423f32cc1360413100852/wosafuma.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/tadas.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/kmr67131v47lstkp3b4uhrg4k0/96601271262.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/c5f5f0a12c71c182f55735cfe6863851/29061483897.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=halimbawa+klaster+o+kambal+katinig+worksheetsPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/61659640bff47d9f1da3dde3d5fac2a9/62442803325.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_off0000d0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CC 16504 bytes
SHA-256: 904c9b8e55bdf69bddc8dc31e653a7ee4b33e7e1bcf0fee047127595ff45c9bf
font_02_sfnt_off00011380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11380 10864 bytes
SHA-256: d46cef0f3cfbbd0aac7d8f60e023914e44e0f3f8787cfd85c5f28babcc4cee28

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