Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6e05d0a571bceb3…

MALICIOUS

PDF

125.4 KB Created: 2021-07-02 07:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d28ed11934d4ef29017c914c11b09721 SHA-1: 6bf6fe632bb9fa9794801fab3d3b658fd4104850 SHA-256: e6e05d0a571bceb375db7b04790d308a520059fe28f196e30224242fad0ac3b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress sites and other domains, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and link farms indicates a likely spearphishing attachment vector, aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://wastran.ru/uplcv?utm_term=math+expressions+grade+3+homework+and+remembering+answer+key+pdf PDF link annotation
    • https://lesartsdansmonjardin.com/userfiles/file/20210627212137.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a445eb22796---51281980763.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/84731631390.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/44345690835.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/89847939942.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b227628f7af---rawejunajakijomizowaxi.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/3549130479.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072600eb0e58---44125742376.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/urk2ccircprjn6t2eplomupu30/96882535492.pdfIn PDF document text
    • http://teraval.cz/res/file/54976334305.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080a78c55434---rukipoza.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160872b1781ed5---23987324503.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/3389095857.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160701916ae7a8---jifofa.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/8d440ab3ff11044b76bb640c8719c617/22622806256.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f0fae2146---lolax.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/u5eennget4gf9pj5b596gv1sh9/14114935298.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077185327baa---toxoxik.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/xomeda.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/14ea3f396d2ff7389c9e64ce34345439/56431659303.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/832792de3efd00c82aadf95ec73c2ca7/guriranikozix.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/bcf57b0168fc524675d02152507b72eb/dubagomalezumabusi.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608867fe5e390---bifidazusaremijesik.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078a289e83e8---32323254024.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFA 64384 bytes
SHA-256: 686f9bade32b7a634a060166e61a130abe5048c3ee0c6381ad2984eec004bffe
font_01_sfnt_off00018f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F75 11596 bytes
SHA-256: 609c7de5a462f2ca97b709e3bf32184aac1db4f44dd999fea58c95248acb2b08
font_02_sfnt_off0001aa85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA85 13340 bytes
SHA-256: b0837d48862786f5642e2ebf3526512caf57ad7e98626e9f034be7a8e83b567a
font_03_sfnt_off0001cb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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