Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ad2a283b77faef…

MALICIOUS

PDF

86.9 KB Created: 2021-08-03 06:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ab2880308f43063d9ccac5552b7a1aee SHA-1: ccbc1ad94cf6b5746059d3b1b6438f16f51c704f SHA-256: 85ad2a283b77faef74f2106f2f68b48a4428e6da6091f28dbad6bf40f4973bbe
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. This structure suggests a link farm designed to redirect users to potentially malicious content, as indicated by the ClamAV detection and ML classifier. The presence of multiple compromised CMS upload links and SEO-disposable link farm heuristics strongly supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6dbd05d238---72334298280.pdf In PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/aa8e6e80db208026e92473c7a0df7c40/vumowutilubegejarumeru.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210623012502_383141473.pdfIn PDF document text
    • https://ckd-otto.com/contents//files/73910860359.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/jalalevip.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/80888011993.pdfIn PDF document text
    • http://oprfhs70.com/clients/879438/File/defafokenarupiseju.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bbcf8191d---93749623907.pdfIn PDF document text
    • http://a-pluset.com/userfiles/zawed.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/20baafaece6f5818e85177acd7148a31/43688233107.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/52392065621.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/3avsfaj310bdkn0ns9cm0qluv3/50995114500.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/438070ca2cc9d918e393bbad727c87a1/lonenobizomu.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/jixedubebogerekijube.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/835555bc3bb3e8ba99f36090c7d7b273/bopasewekubavepevimonidob.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a853c976ff7---44704986283.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/tixesawusoweropomugexa.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/gapafurizilebijabokobaku.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/jeruparivivekamevaso.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4cdc8064b---xurigidakonusavaf.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/b87c192a200b504cfdd232bf5cfb3af3/26066540873.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/84682773180.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/53rsj8g9ghtfn7mdgubblfqf9e/61357308446.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/143787357460fb8f4fbb94f.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=aws+certified+solutions+architect+book+pdf+free+downloadPDF 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_off0000ed02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED02 11116 bytes
SHA-256: b390432306a1b85c730b190873c24ab956c089e636daddc12bec0793b662a661
font_01_sfnt_off000106bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECF 17912 bytes
SHA-256: 6bac238f0d031848a72ca4a83014453e426750f78cdd45af0f4b3d6428f3d889

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