Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d500d48cfd2d951…

MALICIOUS

PDF

82.3 KB Created: 2021-09-08 12:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1811aa2f4cbfedb86b64bf51a6d2b9e1 SHA-1: 15241cc664b2370aafba64e9eb76f77f33f103b3 SHA-256: 1d500d48cfd2d95138e13d33c448181a721c69946a1c168283ef7fb597cb79f1
96 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites, designed to lure users into downloading further malicious content. The ML classifier strongly indicated maliciousness, and the presence of multiple links on disposable or compromised hosting supports a phishing or redirection attack pattern. No scripts were extracted, limiting the analysis to the document structure and embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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://mdfgiare.com/upload/files/marezisavogadop.pdf In PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/dapedibunikodajumili.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/vedenevaduz.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/53858049620.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/mudaputesus.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/xijewoj.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/fawigulovo.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/vanamibatup.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/lisubejozajaxirekovisu.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/logiribulalovizugekizalis.pdfIn PDF document text
    • http://www.bandungmesin.com/file/dikiz.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e70f3b7e4---51215914892.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/gogifukufagina.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/3b451f66d2983ac52f4e562e2107676c/sutorigetezunebosexaxok.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/95643907203.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/82574608098.pdfIn PDF document text
    • http://szm.hu/userfiles/file/25155445851.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/82512802557.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613425725fce3---36636708899.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/2381401353.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc635e6fa2---wojivuxibegi.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/16547571217.pdfIn PDF document text
    • https://labelmarket.pl/data/file/10323675057.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=rhcsa+book+pdf+free+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_off0000dbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE1 18244 bytes
SHA-256: 7ccaacd8fda38d590b04ba7111a7ed8234a3e07dbb69ce37194de80426a5e565
font_01_sfnt_off00010a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4F 10892 bytes
SHA-256: d715e513b6b3a6027c956c42f1e2a3ee9b0570fe5359aee4cdc33649af534a9a
font_02_sfnt_off00012353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12353 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1