Malicious PDF — malware analysis report

Static analysis result for SHA-256 a666f82f3efcfca2…

MALICIOUS

PDF

82.5 KB Created: 2021-09-15 21:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 35434dbc6d5d0b3426dfa95d3334ed1f SHA-1: 93c8d38224acebf21adf6d09686d95415a832478 SHA-256: a666f82f3efcfca24b5b9650bdb1ebeac6f42fb2659fe68fa714f3c2550962e8
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially harmful content. The presence of these links and the overall structure strongly suggest a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.agcontraincendios.es/ckfinder/userfiles/files/fowawufogapuzuvoz.pdf In PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/96236909082.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/4f5c3f9ae1e6e461238fb3a0815ddcb2/49227526294.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16132f95ee6f8b---58847167851.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/zatopojomese.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eacfd87489---10738345792.pdfIn PDF document text
    • https://valergences.fr/userfiles/file/95511400928.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/rejepazojopijivo.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/89637618562.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/6764528682.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/60317716663.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/12576929842.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/guterutemivaromevadogopax.pdfIn PDF document text
    • http://deforma.it/userfiles/files/jijujus.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/335b0989c65ac67b860c98ea28e4ae9f/rofabobapokonevivew.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/nivakefarutemisabojawixo.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135371d022f5---lofepixewipozukenenolur.pdfIn PDF document text
    • http://soc-in.com/data/media/files/50631385447.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/lopalatodejorotasid.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/golafefad.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/sititajekitateme.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/gatarewutomiwirupoxuju.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614090d1ebd1c---fusejadapinami.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/goniwavibifis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=galaxy+buds+driver+for+windows+10PDF 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_off0000dc05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41C 11068 bytes
SHA-256: ca4ddeddf35f91755cdc60c252fb892d3fcb1b69e6d3ce2423dd82dc49399a56
font_02_sfnt_off00010e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1C 17960 bytes
SHA-256: 5ace0bb34adf9dcef14073d64011e42e556e2f319f51ca263a9a1e26c9935067

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