Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1076614f878be69…

MALICIOUS

PDF

82.7 KB Created: 2021-08-23 14:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a0d94a1dc95e9be66e02d2bfc12ca35f SHA-1: 58b0b36bd0bb88889bc15b7c4fdb7892a5b7ee0e SHA-256: f1076614f878be690e53235f81bd2ed0be3b541ecef31ea2a08c1f8c1422de6c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users. The 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics strongly suggest these links are part of a malicious campaign. Although no scripts were explicitly extracted, the malformed stream length and ML classifier output indicate active content intended to exploit vulnerabilities or redirect users, likely to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/2trsofsvogdvsb5dg1gccooi18/roxekonivipugifoket.pdf In PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a7662e3cb---tepov.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/pakijepubolifunimalo.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/loxevev.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075fadc6f9eb---tenozolabewagibusu.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/sewibulipakinulokojozuri.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/xakoxugejubabusuxosiw.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9ef1bedc56---6757082498.pdfIn PDF document text
    • https://birudongker.com/contents//files/86391736215.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/xuzibomuwaregezoxuwe.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/saxuvoxovotejirurominem.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/namip.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/vefozuzuxiwofukulurajofo.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ad48f18de13---zomewagoj.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/piworotubudutijawumaxep.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/5873ad6e4feab5d344af04d5768b96d6/14158751279.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609647a611a7d---19293950354.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/60659849068.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=polynesian+turtle+tattoo+meaningPDF 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_off0000ddd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E2 17496 bytes
SHA-256: af62706f1c793a35b068ed93cd0bcb68a24191c30c7bc5dca05c744ce595380e
font_02_sfnt_off00012386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12386 10668 bytes
SHA-256: 56fab534e1dd5d064519f976ee56a3bf665d1af35fa2be09877750a63493b641

Open this report in the interactive analyzer, or submit your own file for analysis.