Malicious PDF — malware analysis report

Static analysis result for SHA-256 67135581673340fc…

MALICIOUS

PDF

105.6 KB Created: 2021-07-06 21:18:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 914c26a8280198e31d9e24ea997c780c SHA-1: cdd65376a0246ed730824bc89dd3e30f1f9a8097 SHA-256: 67135581673340fc5e6853d32465b2c8f5ff16305ac169b18db57f502b65c33b
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload sites and other potentially malicious domains. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest this document is designed to lead users to harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 https://uniontend.com/userfiles/files/95844843400.pdf In PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/dakugetubi.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe742a2e53---rimaboxowakofiwalezej.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/pafefirasix.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/9d33d57677b87671c324bd98f2f22f57/wuwebogumozin.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/1aadbe1a00355ca7dfcdd121faca9e52/kamoweluridowupe.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/738533f92955921dc198d07c58b5704d/xeruzozexoma.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608189619f26c---78701162158.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160b52c2ecc917---sozolakevumetuj.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/11235234299.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcd9afdc811---70432703221.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/fupopukasuvix.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c67b3030d9---jokanimajufamixirukixe.pdfIn PDF document text
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/rimemobunujisufigalevedi.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5d445d3f2---85000327234.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/83136997666.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/sibilonerijiwobibegal.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a27ec834cf---26861591857.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/94923085885.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16079402a6e3a2---xukodowotaz.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/tisogefudobasivelaled.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/11314796714.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/805948d427704ff006f33df3820f0d7c/18665260704.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b06a98491e7---jajava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=http+request+structurePDF 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_off00013cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000154df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154DF 10080 bytes
SHA-256: d7e024251b0ad256c21fb76ba0545cf88d14a6cdd7dccbab8313626e36362a15
font_02_sfnt_off00016b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B61 17516 bytes
SHA-256: 97ab6f19e6b60f07df0e65c80eecf3b59e16a36a80ccd00fb66d774e7e99dbf2

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