Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed840196e52f3cf7…

MALICIOUS

PDF

71.6 KB Created: 2021-09-15 13:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 253702058b3f2c0e2bf5bbd0133b9965 SHA-1: 7a76a8393c0c4f27126f8e01e9db3d8660f9ccf1 SHA-256: ed840196e52f3cf77cf7cc75829817d79ca15d94ed4e0d2ed118ede4ab3212d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised or disposable domains, likely for phishing or malware distribution. The presence of multiple unknown URLs and a specific compromised CMS upload link further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://bckbytow.naszbip.pl/img/upload/files/43148974885.pdf In PDF document text
    • http://herve-coiffure.ci/files/texevopotel.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/sixuwirexewuwopopilo.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/fevebisuzoboposogonajafoz.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/060026044664.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/tomerigev.pdfIn PDF document text
    • http://biosite.ru/images/news/file/jofinujifabuvedoratimed.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f39b58e3e8---bojokamejurujukusisanup.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/88580324514.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/42497800830.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/59249955443.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa6245ebd7---fidazesupudipum.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/13259459539.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/5a8c880233a44ad6457409f0fedca7c9/kepatalujorakepa.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/21843161022.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/kijajepomumobimis.pdfIn PDF document text
    • https://beautydent.hu/editor_up/65665374789.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/24639178429.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/zimanedafa.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/tivokaxum.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/1fce82c589bd0d70cf22b89a51858cbf/58134549746.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/25198494682.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109070652569793.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/92088707316.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/9091343574.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/3816db8588fd1947058d4e331932c153/49470780092.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=friday+night+funkin+apk+new+version+downloadPDF 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_off0000b871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB871 15068 bytes
SHA-256: 9fd7c2c114258af78eff27a2419c9a7f83cd102e12447bc82df730b3d4c112f4
font_01_sfnt_off0000de81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF698 11212 bytes
SHA-256: 5200d7fd7763350e78bd9f1f6ba3af45c1dd03df856409fbf26056689dfae2b4