Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0bf157cabe9498f…

MALICIOUS

PDF

90.5 KB Created: 2021-06-27 01:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2549897a6233d4bcf3bb4c6a042d5787 SHA-1: 84320626ca0b7b4388e595f3e50cdd299837a009 SHA-256: d0bf157cabe9498f3a89bff3614348bc73f55d8f85580569ccb63364c87254c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=ward+linkage+in+hierarchical+clustering PDF link annotation
    • http://classicalgardenstatues.com/uplds/file/74797191544.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/vomigegedexekebewujupad.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/8rujs9vinin9ciupqspako5h60/jozinebot.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/fikog.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160af6da20debf---zokivaxudora.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/fovej.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/41970291961.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b10433f253e---nexekeper.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/g8et4b6cqf64suhq54j3kf9v86/venagapaxi.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609985d3cba9d---zorepadenovesipinimug.pdfIn PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/gebabizewuwabojo.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/40dece58d0c37985fcefb09dc6489b14/foluxejodomos.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26fe347eb6---55766996136.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983c0ae974d---6285694941.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607459fb9ce36---sativuwim.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870b6d4a90f---xaravebaxijafewikupome.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608407095fe5a---92033788287.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/dedukameru.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/0366e546b8a3bebb89158f4d0314f4c5/mezukavibogu.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090b578c8706---60445064619.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/7d9f638cb1266198abb55ac3784dc7c4/banofelupepanuzuw.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160729f3967e1f---64578124364.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_off0000fe82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE82 10712 bytes
SHA-256: 3b7f2204d69d06d3e9cfe8a850d350f56a4c71bece35d8533053d29c63b58461
font_01_sfnt_off000116c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C9 17424 bytes
SHA-256: ced79e06b09acf4c73aaeccc491733dc3e926bdad6521129388e90f311058eba
font_02_sfnt_off000144c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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