Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c9a1baf63232b6f…

MALICIOUS

PDF

81.2 KB Created: 2021-09-13 02:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: b0a6475c1c16d88d6927966f02382216 SHA-1: 442d9a3f37f208d8b9d5899420922d9b4212ceda SHA-256: 1c9a1baf63232b6fb76818e421cb68e21e2d2c6b8ac119c955374b1467677164
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://recit-de-vie.fr/userfiles/file/kibazajozukizefegavur.pdf In PDF document text
    • http://napiarsaigh.com/images/88641868728.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/12301759358.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/vowuzezita.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/53662026785.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/rojogutuso.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/livedevo.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130edc44d848---34376805021.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/89794822412.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/xoratexuwekivemotir.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8bcd0cfe9---51329069516.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/joq13upklargss3mtblp3aad03/406402097.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131beedea452---dazabel.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/21757288457.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/23068944456.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/xupomizuvagu.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/47208131002.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/rolaju.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/wotugorazadidasejozamuke.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/86542174359.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/20067773765.pdfIn PDF document text
    • https://somogyplusz.hu/files/32185919640.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/gazuvumaduvul.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/bomowebajunemirope.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/90906141851.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=4k+wallpapers+for+note+10+plusPDF 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_off0000d85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85C 10692 bytes
SHA-256: e603e1c34d00073baec0e2f96db716133352c7ffc686fe1b439a489a053d7bb1
font_01_sfnt_off0000f134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF134 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10946 17848 bytes
SHA-256: eebd77ff227ffa75243b9baa2d5d4adaf089fefdde5325f793c8c9abb73a17a5

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