Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f669aa5d1e01c09…

MALICIOUS

PDF

73.9 KB Created: 2021-09-22 09:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2acd10bc56a1a9112007dc1fc2c4b7f2 SHA-1: db15e53b10444ff515c3f6afd458d63cb17153f8 SHA-256: 4f669aa5d1e01c094f1dd55705ec92f841004e4a45519fa50cf28f947d79c6b4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable or potentially compromised domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the classification as malicious, likely used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ljsmelt.com/upload/files/xukamesimirejugogibogex.pdf In PDF document text
    • https://vadihosting.com/calisma2/files/uploads/rerag.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/9452516901.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/40507240217.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/tixexarake.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/sexefudifebukaf.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/juribajipo.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/37679993131.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/zukodibivijoguvuxuraro.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/47302963112.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/mabobowi.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/mesusupijirez.pdfIn PDF document text
    • https://gmt.twwebmarket.com/ckfinder/userfiles/files/76617052679.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/c096270356425720f8afc108fe590f5c/53712956109.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/depuzato.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/17305919944.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/2447512864a8bd0492babc1fa11b809b/salikorogokegit.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161393d29f2677---28523043841.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/tapadukawulij.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210918044559.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/78975059276.pdfIn PDF document text
    • http://sireny.net/share/files/vomanamodava.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/98151854567.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/64645300404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=english+bp+full+moviePDF 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_off0000be2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE2C 16844 bytes
SHA-256: 54d3630cfb8c5e4ed94b8f4b9b706a89173d309ab145a6fd8e5f49ba5e00277b
font_01_sfnt_off0000e964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE964 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001017b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017B 10732 bytes
SHA-256: 35a9b52b8ec50e7aace6cbbb6fa701b61476069f01d9d59b7ad0c3b820a85e2b