Malicious PDF — malware analysis report

Static analysis result for SHA-256 eae595af02d3caa1…

MALICIOUS

PDF

75.1 KB Created: 2021-09-04 15:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b8b10330fec66a4bf53f2c5db15a454d SHA-1: 9ea441940e7254e02a3839158013ed88649e3ba3 SHA-256: eae595af02d3caa1a43f773677fc0039982efb24dba6f595fd23b95f96593f2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to numerous PDF files hosted on various domains, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://chieucoingason.vn/files/torodetulale.pdf In PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/gadil.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/2121208818ba155a075ec59a8bb876b2/64584116386.pdfIn PDF document text
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/4771139411.pdfIn PDF document text
    • http://dalaichau.com/files/bomojo.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160af6b38de3c8---5504267217.pdfIn PDF document text
    • http://giriconsultancy.com/content_files/files/gowevigesamijosofefosuk.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608507b9b9756---jonixanutas.pdfIn PDF document text
    • http://geoman.cz/data/file/jukibolamokeve.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6682424827---xisajuzi.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/6716066411.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/47777804794.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/0ffbdfb460d8dffac1a3925e47189fcc/31756207495.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f0764ef2aa1---95530915776.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/7322c8441d2b7e3fa5af2f682e3de543/99944052822.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/vevidusuxi.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a73c9cf899---wajotovenijefarobuline.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/tutib.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/susivonaduvivomuku.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/xubojosi.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/38cbcbe1bd32ccdd62b0b78026a376f9/85405396298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=autumn+in+new+york+lead+sheet+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_off0000be25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE25 18232 bytes
SHA-256: 2913a6c7783df1ac7014f354635b0ec3e408fd862386b09ecced2b17f9248640
font_01_sfnt_off0000ed18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED18 11136 bytes
SHA-256: efd2c96f95ba2cbfe55b876a3a0551ee01bd4584492a7f5d8a31d780d5470d83
font_02_sfnt_off000106f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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