Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ef752f411f6c3b…

MALICIOUS

PDF

86.2 KB Created: 2021-08-17 12:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 99a5ae46e867ef25ac0dd6ba050a8548 SHA-1: 5f534c3a44eed891c732c3d45e85f278cc70e31c SHA-256: d7ef752f411f6c3b2edf11fda2fa57f1c9848ad7b9fcef8c2a3eb4837552c9e8
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document's structure and embedded links suggest it's designed to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/ceff7dfa9e8b6e855c4d3fe5e9c31467/bovizufopod.pdf In PDF document text
    • http://ankurgroups.com/userfiles/file/gixobagulose.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/95732187431.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/1387e975de143bc04f2aa6bb1a715cd8/20631172497.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/65015827490.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/16936813162.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/mewiwudipofagafumamewut.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/94661595094.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/37270866359.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/72606200255.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/13555581497.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf016560026---30256831946.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160e1d8e426b1d---mobuvujodu.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac697829fe7---36861218765.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/eb9atmajvotd52tbh4hrn02u79/tisiduputosesaranenosopuj.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/89486963338.pdfIn PDF document text
    • https://artenika.pl/fck/file/46377908371.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/rowuzige.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c240d68ea7---jefuzasupazadogisani.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/7104800730.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6c05a1044---pabavotadojisoz.pdfIn PDF document text
    • http://sns.hu/_user/file/gebamukopatamidare.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/pimanolawowi.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/24725768440.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/famoxixisatagoralupatob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=piano+no+mori+pelicula+completa+en+espa%C3%B1ol+latinoPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB8 17860 bytes
SHA-256: 8f87058440e579e7df3de6ffd5a969a1d8c7375272031e3f60f2d6efc924c706
font_01_sfnt_off00010bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12406 10840 bytes
SHA-256: 8a104b4830a6ca21a11ae93354cab760e344e4b9b491b208ff9a9ec065daa37e
font_03_sfnt_off00013cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB7 2332 bytes
SHA-256: 51dda2b2089ed034ea18802440c0469b87c1c63b6a475a2353cea562b738192d

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