Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2432cfe24e369e1…

MALICIOUS

PDF

74.2 KB Created: 2021-09-28 01:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 377d8300e47f1d9ed4e101f5864f4cc8 SHA-1: 42aee938401b8c83286832659a3aee8caa4732de SHA-256: a2432cfe24e369e1c58c66a6ea94e321cc70332a63ac031a67c6e75e3e1623ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs indicates a broad distribution effort, likely for phishing or SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/58c5fdd119467b62a7bf6c5f29fbd898/9587144431.pdf In PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/26131091774.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/33561875830.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202196_211156_921.pdfIn PDF document text
    • https://nepaltravelsandtrekking.com/userfiles/file/repizefatajavamadivobixa.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/rajetutemivu.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/39059972593.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/48672906138.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vosanugirija.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/tixexewidetuvekor.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/mupodiletaxamuja.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16148cd2458dd0---5089107740.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/vawux.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/40287818662.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/vakibosololof.pdfIn PDF document text
    • http://vina2002.com/uploads/files/38374052371.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/fobum.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b43545dc07---gexirotobutopis.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/gonepenorerevepenusoli.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26064095894.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109181006356406.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16145cddf30cc0---46030541268.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/zokujiwibejed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=aplicaciones+android+entrenador+personalPDF 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_off0000bc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD496 10488 bytes
SHA-256: 2b29c43fc0e830a4ca5c174f039972c2901b29fc71e1ff57b9fb14eb000b12ba
font_02_sfnt_off0000ec96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC96 18260 bytes
SHA-256: 23a601aa2357427a9b37cfe3c6dd042b9a2468a85eb1eee4d38cf8cfb0ed926a

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