Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f48b25c457e19f0…

MALICIOUS

PDF

75.9 KB Created: 2021-09-19 13:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 611d82838445bb5636410fffefad9b65 SHA-1: 9da2949c82f39f589738c09db36b9b8535f3e9f9 SHA-256: 5f48b25c457e19f0255365d3b03416b294090bd2785025ac8aa656fe5825cb60
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded links, many pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent. The document likely serves as a lure to redirect users to malicious sites, potentially for credential harvesting or second-stage payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://nomylo.ru/uplcv?utm_term=how+to+make+group+chat+on+android PDF link annotation
    • http://brunagabriele.it/userfiles/files/14732676745.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/siwapexafitomofizibufiva.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/xinoromivedefobatimen.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/laxifabedevan.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/72802122540.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/89983939755.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/fefinenebosoganogilopedo.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/03/katelanivigumoli.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/84139311323.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/54203860319.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/17630472025.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/8992721388.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/golivorigi.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/91853134955.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/pelimugepidipiporimug.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135683cd9623---kitababijojuxanisonoribox.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210911185434.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/d8e27188ff249710cc944a709415a256/suzelatixopetojezovute.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/levogisuxeperizaxix.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/206ddb7c3bec0a10d124c0173ffd4ca6/26663085613.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/31025946754.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/e03ffc8efda8372f1753298262bc1153/8362673296.pdfIn PDF document text
    • http://cichanski.com/Upload/file/22035069781.pdfIn PDF document text
    • https://parkettworld.com/upload/files/11591902120.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_off0000c507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC507 11016 bytes
SHA-256: 8a1b41aa4fbacafc75e91daf307c39412d67b05970bfcff52e8b3ec5c4d481b7
font_01_sfnt_off0000de3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3D 16812 bytes
SHA-256: 08f6144377fd6159925b20108b9500355f253bf91a340500e96bc21c55709287
font_02_sfnt_off0001095e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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