Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3ccce791e2be697…

MALICIOUS

PDF

88.2 KB Created: 2021-07-26 07:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 840749dc679f67dacde74e5b7795acaf SHA-1: 64764549bb619a85db78d383527da6cd54a3074c SHA-256: e3ccce791e2be6975130ef15740cb94d962128adcefa08106105f0d586804568
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as 'Pdf.Phishing.Trojan'. The file functions as a link farm, containing numerous URLs pointing to various websites, some of which appear to be compromised CMS upload directories. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to redirect users to phishing or malware distribution sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16085c993864b8---45672706001.pdf In PDF document text
    • http://montaze.org/democms/userfiles/file/52163133204.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090644d22d8e---zibabiw.pdfIn PDF document text
    • http://ipllaser.in/uploads/49600545058.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/np2bn7n5irk2vap4op4pskvkuc/80268832170.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/11092659463.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a4147d2e752---52000028834.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/kevazoxibegulogor.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/72446042324.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/734dfbf4d0ef35d4a1fb01ed7896454d/56116688225.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/48473359356.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/29041826537.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/30890513086.pdfIn PDF document text
    • http://metallpress.ru/files/31115672307.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/k1u1o4krm8b2v6vk2dgjl7j34a/supuserefesexomew.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d9835bd57---7423014074.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/20828234113.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/pirovadadopumowe.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/afee462d73da47e22f89d4644aa65d97/98464801188.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/13913ebb02fa029f5c1d7e172a855ca2/kitavovapemizosukefi.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/45137732377.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210525141933.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/jmvbla6n6a398jnc7ja3njlor5/mivokodizuziwalujotir.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/edf5cabf74d116dc773f1ccb07e48c2e/77128883521.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/zovifiluluworoxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=organic+chemistry+practice+problems+and+solutions+pdfPDF 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_off0000f2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C0 11448 bytes
SHA-256: e59b9552b08320324ca1910aad916a64a69a8a47b21a4e200562338eb38670a3
font_01_sfnt_off00010d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3B 17248 bytes
SHA-256: 8a1d50d3ab63eb9a31cc3c0bf1dd2525019de4713ab9f58315f6f561083b0cf6
font_02_sfnt_off00013a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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