Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4449f728da5c0ad…

MALICIOUS

PDF

80.6 KB Created: 2021-09-08 23:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 744e9faba33883a44f2cd996ea0f7782 SHA-1: 0ef678af5b1a2476353795de801c422633889a0c SHA-256: d4449f728da5c0ad3b4d457c5d710d4fe843f983598c4b6e80cecc62a4f5be6d
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage and other unknown domains, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded URLs indicate a phishing or malware distribution lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://birons.net/wp-content/plugins/super-forms/uploads/php/files/a9cf9289af84661eb31fecb884f8edd5/13970816706.pdf In PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135e7963fd53---41674749103.pdfIn PDF document text
    • http://bidadapatidar.com/userfiles/file/33094616479.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/39312505579.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/86311082180.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/26931475678.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/26234840982.pdfIn PDF document text
    • http://nusamulticentralestari.com/Uploads/userfiles/files/40226606481.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/68007457901.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/pawigisololixe.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/1451016109.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///pejej.pdfIn PDF document text
    • http://eventechsite.com/files/files/55915359212.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/94122549083.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/xepum.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/likifaribavam.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/65723651976.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/mopupabu.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/92854783548.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/nopunasufovezu.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/161327087a2e5d---87475603489.pdfIn PDF document text
    • http://grandviewcommunity.com/userimages/vaporu.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/gapatefojosugoxuz.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/wejatevunirumivikisokes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=free+figma+component+libraryPDF 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_off0000d4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E4 18108 bytes
SHA-256: 02ba85af0bdc222c00760ab06e8c39cad806a05408359a9e4ec1f8f035a424e9
font_01_sfnt_off00010448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10448 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5F 10888 bytes
SHA-256: 60bd05f16a5029512d93098a386c25f7e9bfa9ced92c28d94626c9ec2c6984e0

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