Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5eb2e5f96476950…

MALICIOUS

PDF

71.1 KB Created: 2021-09-06 21:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0331b5092c6bdace2b8c2a3a55652179 SHA-1: 434ad61617cc4236e1b2c1f12ede95f4a8b1246b SHA-256: f5eb2e5f9647695077b79e0436398cf2a873d8732eb3af64ed182f6a481a53c0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, with numerous embedded URLs pointing to external sites, many of which appear to be hosted on compromised WordPress installations or disposable domains. These links are likely used to redirect users to phishing pages or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://pixomot.ru/uplcv?utm_term=honor+view+10+lite+manuale+italiano+pdf PDF link annotation
    • http://fgosvo.ru/files/files/48345770555.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/didatuxomogaxifolobizilok.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160810eb3666f2---92847258574.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d3d839bf5d3---jijuga.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/46546822886.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcdb5b0b675---zinutefofogaxo.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/sumubegaxusase.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/wigus.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/35002667977.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/zefedevomolobikalupa.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/53120942721.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083c7cd01165---15783032218.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/livemukisok.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/vonatipivapinenewoj.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/dexili.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/n15rfmn41va2mcbif7eu8jpl3p/vujimufelujepeburu.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/6rfenblhc5pe6rf53ptmckqn0l/zitisikupowopexi.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/a706548c185095e29bb3a41d57f02f31/79225865010.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/30907034080.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/039d57cc556dac533838127f58decb5e/7924867037.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/34632036864.pdfIn PDF document text
    • http://blsfamilyreunion.com/clients/1/11/11e20eb1c47c3498ff3e66fc1941d138/File/9295250664.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f02d8707bc7---mepelokusegegizojusu.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/59722994997.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b844470e033---23266348811.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_off0000b372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB372 10908 bytes
SHA-256: ed5438ae2a33be5df61d6ab8664553a7d09c381340dacc22bae913b68463d311
font_01_sfnt_off0000cca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA7 15912 bytes
SHA-256: ad0dd8bbca463d66fc3f29282924a95b7ca34e7b0aeeda8f7215d4b35a201a68
font_02_sfnt_off0000f4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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