Malicious PDF — malware analysis report

Static analysis result for SHA-256 679a46a3ed56932b…

MALICIOUS

PDF

148.9 KB Created: 2021-07-15 10:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 62a128807f305bae0d422fd4527e7a1d SHA-1: 6d32aae61d3c60afbc447bcaeef1f209e09fb6e6 SHA-256: 679a46a3ed56932bc2aa1f469adae610844e0fa114d49abf1058cc6944eddcbe
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

The file is a PDF document that exhibits characteristics of a credential harvesting lure, specifically targeting multi-factor authentication or one-time codes. Numerous embedded URLs point to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d6cf4bc0ed166b31f80ff40a05230aff/buloresorituses.pdf In PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfe8caf436---30940392324.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e2773tgp3hv0rt7v7q8smgc62/fasilew.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/364u2r8m4t2qc4dd7mdl2dh763/76324641171.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/88c196df27a3df87b1629eb7727ead5a/45216749571.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/jevisitib.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/77769748294.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16086ad2db85e6---95638765158.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9b9976200---29045766285.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/a9cfd4314bb21540dced87671ad13232/dupomomofebejipegik.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f7ee8d96f---34398579867.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160874a0f52972---48653332624.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/d6d4139a0cb30739e999dc9fae5d1887/dufivezosovuz.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/1a8ffc754771938b19ce7ef7632e4929/43892995211.pdfIn PDF document text
    • https://mmszke.hu/files/file/seronabevutipa.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/69146090537.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/susixixekazezawomowinow.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073df0f25c75---47082534254.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160c708f2384da---79133776714.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/896e9f9327859dc046c2734548c8d4b5/86348344868.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e732404a8a6---sipuveza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=wordscape+answer+all+levelPDF 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_off0001e9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E9B0 10460 bytes
SHA-256: 4991f649836c099761fe124eb509faf3f9f7be385d916be6c856d77db47e677f
font_01_sfnt_off0002019b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2019B 16680 bytes
SHA-256: 8d18cd6aa0069cc84a1d8f8b5e6d4542acf8a192586527edad6967b98d232359
font_02_sfnt_off00022cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22CDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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