Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d30d8d2fd78d5c6…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 00:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3cbdfa5dff4d35d2e354b8eab4f2e9ed SHA-1: 4535079407449767c2e972b303bb6cf7bc124639 SHA-256: 6d30d8d2fd78d5c65d5fdc13fa8ab298e6defd7408cad6dad5058fd27108f9d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document exhibits characteristics of a phishing lure, indicated by the presence of numerous external URIs and a link farm hosted on compromised WordPress sites and disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a tactic of luring users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=camera+stickers+android PDF link annotation
    • https://nmcs.ca/userfiles/files/rizewimofawatujazak.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383b0b824c0---nozasujelunarewajofofa.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/27677621779.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/40337663213.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210914_040144.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/d345fa3650cc2e32681e2f3942c0ae27/zamaragowidosazodatekuko.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/f20e4fdbf17dff0179206b5759824d0d/fojuxilizudu.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/52329556584.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/sojulagukemat.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/zibojutaxefebi.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/metimug.pdfIn PDF document text
    • http://china-miyaco.com/img/file/2021939222.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/mokotafuxuzepifowotin.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/22232491218.pdfIn PDF document text
    • http://wacommerce.net/home/integrity/public_html/ckfinder/userfiles/files/25903300390.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/5803037019.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425f6b9fb3f---264695215.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/13634085562.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091605030898879.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/51583139958.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/92651507020.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/28856074746.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/dafetutobovotuvabep.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/labogegasar.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_off0000d841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD841 17736 bytes
SHA-256: cfa13ff6a207b18f74a51e9d57b8403c93acadf85935dd97e804a2fe5c4b6618
font_01_sfnt_off00010635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10635 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4C 10608 bytes
SHA-256: 0313c1a69f11f522ae0447a74ec3be3b1b22c0735b2341bfbaef801689facc61

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