Malicious PDF — malware analysis report

Static analysis result for SHA-256 d906d8f61b0e1d55…

MALICIOUS

PDF

85.6 KB Created: 2021-09-19 15:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a953f6434a4fad82e21da9b399144021 SHA-1: 4d7f941982724b921b1f74290e77653bd2d43415 SHA-256: d906d8f61b0e1d55c1a43812d633296873cb2e4e3dee24ec2c46b523b1bd13aa
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various external sites, some hosted on compromised CMS platforms and disposable domains. While no scripts were extracted, the PDF structure and embedded URLs suggest a phishing or redirection attack designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.biogreeno.com/cms/ckfinder/userfiles/files/67288344660.pdf In PDF document text
    • http://geometramaurotozzi.it/userfiles/files/rorebopizige.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/43242301968.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/c7357c93721a307bd130161f18e214b4/fotoxaramumemukabom.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/jivitinasalog.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/56448159164.pdfIn PDF document text
    • http://standardamulet.com/files/files/625592569.pdfIn PDF document text
    • http://fpole.ru/sadm_files/mijobuzozujipebubumo.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/0f3e065fdb16ea132a40a273498e1809/72696442157.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613deab226015---dunivupedig.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/xuxix.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/vuwewajexarikuzesubub.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/27317hhik1relhka3me2nl53a5/19473285592.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/77622721873.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/jafobuv.pdfIn PDF document text
    • http://toroisg.com/public/images/files/54103210443.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/60363174527.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/29883418336.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/zikunoramiliz.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/puwogonig.pdfIn PDF document text
    • http://umhouses.com/uploads/files/55912431032.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/xonusasako.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/jawadi.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/55945323931.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/zuralojoke.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/wewol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=android+9+hard+resetPDF 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_off0000e7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A0 10448 bytes
SHA-256: 3ed141070f405ac9e0eec26f01d7b2af64d1dbf72eb240c8b203f6dee49fed61
font_01_sfnt_off0000ff51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11763 19344 bytes
SHA-256: 579d480aae75688ff3e86cb1bbca8b1a863657c199764637040e43f5cb1cd663

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