Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe1fbd53c0f6f4df…

MALICIOUS

PDF

148.5 KB Created: 2021-07-08 00:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 4315972a2b2b78ed5ed4e1254e59663f SHA-1: 794a46d37282284ee3d12e9534b7bf9df6fa85d6 SHA-256: fe1fbd53c0f6f4dfe3bd8be75db65b7b3e30e6b34b6d072e5646b16e94f01d3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9719

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://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160adf0a2cdcda---nevavoledovulagejetujo.pdf In PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/k0gmtbuut8io0se1lu82oo1g46/bumojesazutalab.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/658869dd62df7caa17676d42a01f4d27/19053824011.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/totjmjcdesoi08onij2g3bd1al/48311400984.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/19455066298.pdfIn PDF document text
    • https://2acontractor.it/images/file/16303550318.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210609042608-tapevikafukoro.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/xazakodaxujanusegupofizo.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/f4f604ea7f33e570ab7ecb9dbfaf4016/nexulofapojikulodiji.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160c404800ef4b---pusovinibuw.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/tipixifisitajoxojazisevu.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/f2b97ed331397381906b4a53163199b5/meliwuzorujexawetoboz.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ns1dca3gtcadesuutdnhc5n1j0/koxur.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/26824648572.pdfIn PDF document text
    • http://americusfelderfamily.com/clients/0/0c/0c5e5e27a4da9db51eb23c24aa0fa274/File/govatajeku.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210703055733.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/0dca1f1ecdcf74e4967af8d0d89201b2/24977596260.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/46872e942a24b25d79da6811866be9b4/kijukowisusixutinepipiro.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/14132879684.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/15372385593.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/xevabewuwomuvizanizatowev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=birthplace+of+babarPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00020c78.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x20C78 18532 bytes
SHA-256: b7581ea30707a2f2bec09cd70925d69b4e41855996f64953c12220e7908437a4
font_00_sfnt_off0001b41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B41C 3356 bytes
SHA-256: 15ba2fa4ab4ec28877c2c1e678fc78d7343f72659876e551b9103397111b5130
font_01_sfnt_off0001c10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C10E 20940 bytes
SHA-256: 404684ab0383d6b88406197df2315e4477a26283a50f2b8bfc8fbf5f95bf805d
font_02_sfnt_off0001f467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F467 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00022a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22A4E 10496 bytes
SHA-256: a28369c2c4fffe855f3774947905e69d72c36a3f47f4e0cb668686611d0a02ed

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