Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6916a73bbef10be…

MALICIOUS

PDF

79.6 KB Created: 2021-09-10 21:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 2cbf34feb39e31213f56e2f2bc2ac110 SHA-1: 38bf8e154f8f70c00e1ef1c5f2012a37b9827aa4 SHA-256: d6916a73bbef10be7ec07ff3ace671f825c963ae539c4500b746720a08db8828
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/jetgpvoi0ffdo6j1gt02ja0crn/nanamurolekolesusuluvipex.pdf In PDF document text
    • http://gillsandgeckos.com/userfiles/file/wekebakojogumuxowukaju.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/xegevosapanenosemaxoz.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/46572683827.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/faxegowosanebodarivotisoj.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/pozufedanuw.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30077190705.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/a84p3uu117jhfrctedue2us4jc/68787452012.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/pupoxumususitulufaxifubev.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/xonezeferizakisusize.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/refuliloronijix.pdfIn PDF document text
    • http://e-menu.hu/editor_up/kajezajadapav.pdfIn PDF document text
    • http://zerosquareonline.com/file/muzivapanuzex.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/janizarigupitunuzefu.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/tipebuwoletowalufajanuke.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16134c4083f2a7---nugofukofuw.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346d2773ff4---8297733447.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/27509867013.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/45044545767.pdfIn PDF document text
    • http://tion.hu/upload/file/xejidazajevipogubifobezid.pdfIn PDF document text
    • https://umartravel.com/files/joponepugizorevarozotanuz.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/72549931988.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/tufuzubulefiforodu.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/mimobagadanedu.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/rogerolutafewovuzojonaxij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=chinese+lessons+for+beginners+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_off0000d591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD591 10688 bytes
SHA-256: 47ab9697f2336a9cb3ff2eabf7b74bbf94d55885b9ddc7e4b252c2d333379ab6
font_01_sfnt_off0000ed80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED80 16840 bytes
SHA-256: 1fcb4d3d7d43938344b34339f1aaa848b85d567f31e0cb8ab65788a667c65627
font_02_sfnt_off000118d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1