Malicious PDF — malware analysis report

Static analysis result for SHA-256 a77ba43572091295…

MALICIOUS

PDF

86.1 KB Created: 2021-09-07 09:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3b1a253d6c882f9538b5be364abb34cd SHA-1: 12537489b03c113f05dd042d5e9ce3e1e11770dc SHA-256: a77ba435720912952c6c917a5169e8cd70e6960eee191d06ea25bdafe7fa34d8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://easyliveconstruction.com/ci/userfiles/files/jefuxogaribitu.pdf In PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/2c455ff8bddd20026f5a10408aa38664/49685799229.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/bogukif.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/xulerorubebesoketeworamez.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c552c668fc---begonadivifaburexej.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/4473952201.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/fcda893d1762e5ee67704ebbe8b86dbd/dibebewoniweva.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1c09cd96d---37559887958.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160960b79e92ce---tubijilu.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/sidonefotirepel.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/difixafuvosorafuliroxozo.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/fumuf.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/tepajikakivikezak.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/39246607850.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160722dd80a97f---jojazexixomom.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/dosolofepato.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/deec404d3a7a6d1e0fd308fe49eb6f6b/59722518478.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/vhml29k69pvc00j93h39sp8u0s/62104675295.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/76127706774.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16116b478c20dc---96560475400.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c6c014038---butorivawixided.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/3205mhn2mkero0m4jhqqir7ce1/nafunefuletutisar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=international+accounting+standards+2019+pdfPDF 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_off0000eb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0A 11308 bytes
SHA-256: e76ac9faad6f5247ab37d7c89919e96c8042b2f436199175c9ff483730188480
font_01_sfnt_off00010592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10592 17320 bytes
SHA-256: 67d9d10807766b429a8aadeface039f7c9fb2ff00bf2f3e4f3fdc912aeba2eb7
font_02_sfnt_off00013277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13277 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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