Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da212bc4e66be98…

MALICIOUS

PDF

83.5 KB Created: 2021-09-03 01:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4a86d03f91b51f3a61c6c25ae505cdec SHA-1: 1e0a77eda2a0e7f9ce11a987008027bb9a3ed039 SHA-256: 6da212bc4e66be9835d3cb717fd208fc42b2ff84c48c1b872441933ba8aaecd5
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, with numerous embedded URLs pointing to various domains. Heuristics indicate that these links are likely part of a phishing or malware distribution scheme, with some URLs hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://oxigensupplies.com/shipinc/userfiles/files/23750301199.pdf In PDF document text
    • http://gialtour.it/themes/userfiles//files/34347412015.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/71739909367.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/c045d46adc9d5cdc0e7e9dd77ec2c339/deferiboxowawibavanuno.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/98454167867.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/binibolak.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/49643924076.pdfIn PDF document text
    • https://paperland.bg/uploads/file/10551008980.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9d5cbf1d2---gapepofigawejewanatopul.pdfIn PDF document text
    • http://alkanboya.com/files/file///11483583957.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/66470111374.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/232605262.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/buxevobodi.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/25251995652.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/vozadixajixip.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/taduduneponofawibuwuzuni.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/sujafenovuk.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/fezufeke.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/0o7cgkn98q3drtvbmuvknjtfji/madazon.pdfIn PDF document text
    • http://asustainable.com/global/file/87699228618.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/8hcd38upsmmi288aqatq38qbht/83591200527.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/11b012aa62c6b7669aaa86bde12ab0c8/davukesa.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cf1cded773a---fofosikebemu.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210626162467917337.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=golden+palace+menu+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_off0000e3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A0 17664 bytes
SHA-256: a55510249aa6dbefca62397014f38d8639517fe9a3a307caf8bfd776b7993e4b
font_01_sfnt_off000110fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FD 10464 bytes
SHA-256: 2eb23d1c3c3117c69777d4c71d5b18d93c298945abc2443d46659f50dd0b4c42
font_02_sfnt_off000128b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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