Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff827a835e38d144…

MALICIOUS

PDF

89.0 KB Created: 2021-09-20 23:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e761b314b73ce935e960b29c10582e08 SHA-1: a0006b9c3a71043d1708c92c13304148ab94107c SHA-256: ff827a835e38d1444e55e991ccdb977f99fa9773bf1ffeee7161ef2dde1f13b5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous external URIs, including one pointing to a raw IP address, and links to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://padservhosting.com/userfiles/file/lakekinu.pdf In PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/33617226501.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/biwovi.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/33695684117.pdfPDF link annotation
    • http://phutungvespaco.com/luutru/files/ladud.pdfIn PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/88575490864.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/74901821803.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa44f28255---ferelegoxusevowix.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/48680737614.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gogegozugezolese.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614114acb686a---40238911916.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/kenasunik.pdfIn PDF document text
    • http://alptw.com/images/files/kapevuribo.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/12122347194.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/71571280007.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/kepulenuzaj.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/34424497816.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/nonovuzaxupotutebaponani.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/32406188091.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/rafedigoxosidi.pdfIn PDF document text
    • https://pmms-online.com/assets/file/voludeboxolalegoluv.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613389d483fbd---1219090919.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/sokiguruvuviregufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=watch+fight+club+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_off0000f86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86B 17520 bytes
SHA-256: 7ed2411e5ad714d56f2cbd09473d8e50588e1162250211abb06b28a12a8fb9a9
font_01_sfnt_off00012588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12588 10708 bytes
SHA-256: 1bf64c636dc2b057e49516e9af4db97d4d42b545e204a07856817672fb12a846
font_02_sfnt_off00013e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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