Malicious PDF — malware analysis report

Static analysis result for SHA-256 a42b8742c72b1d99…

MALICIOUS

PDF

79.2 KB Created: 2021-09-07 11:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: f45d693cf0f7282e5dd893af0ccdb4e8 SHA-1: 224e3b0371d569e247deee9d5e0484cfce0f35b3 SHA-256: a42b8742c72b1d997f3d2f8d9cf585084677c0ffd9ae632698feca7a66a40f55
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/1876dd1eed09e604f9e5cf07de9724fe/48551745117.pdf In PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/90abf6ca9e7bbfea70836fc7536549cc/vabiwizegirokenaleviguf.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210705151115.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/zekuxaxosalemososade.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fd8655baa---48395411765.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/bns7g8d1lss8lt040ol1el4r3t/45902667144.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/41850210346.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d18c29e178---sibaxu.pdfIn PDF document text
    • http://from.ua/upload/articles/2021/06/12/files/47225402945.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160d7243f95f1a---wikowaserilofik.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/daaaec1544a29e2ca05eca885376d3ae/49033341578.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/vurezoxow.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e8bff2ed69a---93592246795.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/30b2b8b1dcf04a038f9838d9cb54ac89/dedur.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a12dc7ae373---31090645740.pdfIn PDF document text
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/rewododubifavoterofap.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3eb5422c0---gizutomilasumaxijub.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/gafexasuwolivapesir.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735fabbf1cd---gapivejusu.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/94c40dc302b5528a5e827056490803a1/857327332.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/38443832153.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ece58c24fd---31526102399.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/xivogiwovorumogevurev.pdfIn PDF document text
    • https://tl-systems.hu/files/files/bijapo.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210819_2FABB94E35C14BBD.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/geruzadiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=order+of+operations+addition+and+subtraction+worksheets+grade+2PDF 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_off0000cd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8D 18096 bytes
SHA-256: d4aa3d719571cc8e73e1579ab8165fd68c63af7e1caee01a02cf4776b380cc0b
font_01_sfnt_off0000fc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001145d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145D 11416 bytes
SHA-256: c5e4f32183b8ca8911c49ae634fcf03a58184b262dd2439a46ea39fd21b4658c

Open this report in the interactive analyzer, or submit your own file for analysis.