Malicious PDF — malware analysis report

Static analysis result for SHA-256 6debe317528ccddd…

MALICIOUS

PDF

91.5 KB Created: 2021-07-22 01:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 70d3b437279f22deeee8d777e18d80d6 SHA-1: b07f101a01db3ff691aa1c10be23cad4b370ddfd SHA-256: 6debe317528ccddd10acf12e5cb01a9b2d94c09a4b91fd9c8891e2a0c8963acb
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded URLs and the nature of the heuristics strongly indicate a phishing or SEO poisoning attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/5e54602cf31e77b253c3620f503c7c0e/rubolis.pdf In PDF document text
    • https://bititechnika.com/uploads/file/95646138524.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5096d7062---35791137182.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/rabanafakulasogulabumona.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/76051053310.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/ff0d5c542455bf3dadd7826dd01c646e/59017228531.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809381e4f81---64279144825.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/zoxove.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/92665746649.pdfIn PDF document text
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607797bf3bbf1---75074286296.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/14394258524.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/figuvenupujub.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/rirowojawesego.pdfIn PDF document text
    • http://funperm.ru/content/file/9637328999.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/cd382263ae091da29411b34cb18b4319/85769332170.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae6b3b6258---dezofirezirojokebisisa.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/10871164939.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aab33dd8e6f---dufiridoxitomexadame.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/ad91a2335f0568c048abc663956dac79/xupinakamopekuvisataxijon.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/41489837120.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/3d51b2a71bf38ba865a220b017b3d970/68747561413.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16091894320a4a---zasusagusupisus.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/d90abe6815e1c44283ee9e1af1f96ad1/27745555420.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/ba7ca073357990caf62336c1b00afa75/nuwozig.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/b6fcf722f7276caa6336b8558880c521/87600523325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=in+the+figure+shown+the+coefficient+of+static+friction+between+c+and+ground+is+0.5PDF 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_off0000fd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6B 11308 bytes
SHA-256: 6b43aeb94551ce40003e9b5d221d6f76640cb11cd2ed0007146b4cdfe66f124a
font_01_sfnt_off000117d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEA 17748 bytes
SHA-256: 80b9624893b2059626934d58e779b1722772cc705c06db8ecd5375f9f84a55a9

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