Malicious PDF — malware analysis report

Static analysis result for SHA-256 105dc557de6aa258…

MALICIOUS

PDF

95.3 KB Created: 2021-06-27 20:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 7deb67dac360279de9e1acaa186b5672 SHA-1: ab278fffac7b5028dddc06f493a19a46d4ec07b3 SHA-256: 105dc557de6aa258c1e872e658be847ab5f289d52a9a0d29545983ae67156ccf
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 malicious PDFs. It also functions as a link farm, directing users to multiple compromised websites, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/e5718f30b6f3ad094940b2023bcee996/gukuzexakuredav.pdf In PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/79132877549.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/f5ba1b7f92b1bf39c42c85e576b168a4/kesizutukilewozas.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/76148823383.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/fe912f8f938a2972c30378e7b66670c7/bodewutesumebedetonafub.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/befimijemigigodobinemuv.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/77463982149.pdfIn PDF document text
    • http://fotossc.pl/_files/file/dudejizemelizivev.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17bdc64936---69579002158.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210621185210131017d1ujt3.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/f3d4bd44cc10c6e128ec23da4d26921c/vudifonalafuro.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/507daa859d7ab11a004040b28823f26a/64155185545.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/72dc52fd429726a0c9b3488c04172e61/60798787686.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/d110505f3cf825874f87a658aedf6194/97499368013.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/46a0080523ec13eb8689f782240ecc7a/tepowewelijozapuze.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/guvixirivufokodapudejiv.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/50578518114.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/77399550956.pdfIn PDF document text
    • http://hanifeugur.com/image/files/83867033785.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210611091142_rzosv4.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cb595cf7d---91742380073.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=which+one+of+the+following+is+an+egg+laying+mammalPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001139a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139A 16100 bytes
SHA-256: 505f1f16fb057e2a34e7666bb0a43a50f2e0b7bc0033e59b70183295ac12d2e9
font_02_sfnt_off000128d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D2 17372 bytes
SHA-256: 7a3d421a9a5545276191c6f889334038e47b6748d65c0442455c9134713a2348
font_03_sfnt_off000155f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155F7 10876 bytes
SHA-256: 9bdd87d7f2e7a4f1901f3236e46e878ceda4287b4858024bcb58e0cb5d4f7716

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