Malicious PDF — malware analysis report

Static analysis result for SHA-256 44b1c1de142a57bd…

MALICIOUS

PDF

97.4 KB Created: 2021-06-28 18:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8e778520649239c8c0544b95952ce8cb SHA-1: e6124a3406e083cde2e782afd1d95f70b1965208 SHA-256: 44b1c1de142a57bd5a6c077a6e95fdb1e1558f07012781b1177bb7dfb63c4461
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics identify it as a link farm, with numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0dc306593834b8a88512e4cb5b361e21/76956477493.pdf In PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a23677fa8---39454755096.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f617de3165---22308154895.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/46516666390.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/tozaridi.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/49780359905.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/evqbgukgospkjo920c3ipq3gfa/45407485672.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/ragizodejasasileg.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/0901bbe326acc0993a37d17642d5c89b/17183718674.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/68e97488ae497e42d788e60b0de37bde/buvib.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-28/20210628210507692453.pdfIn PDF document text
    • http://howsonfamilyreunion.com/clients/5/57/57b8fe7d350e782a16e6afc8bdcd6467/File/69505636978.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/e27cd8b37c4a4cb6d4d2954ea425e64e/36137370812.pdfIn PDF document text
    • https://daismene.it/file/17288628914.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/kegegaditaz.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2991fd83ec---93173312731.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/wuvofera.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/52107248982.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/f82bea4e6992efad171fc8bab8a9a7ae/tatabawevaxulugaxapif.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985c2ad0dea---mijis.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/momurajerovepapapaxes.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/40893770513.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/9c3cf2f4f7f2e251e55aa2d20812e63a/20637099468.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=and+you+thought+there+is+never+a+girl+online+kissanimePDF 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_off000117a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A0 17868 bytes
SHA-256: de59f6ec3bea4a79b007c01a827349ea6ba02f1b5138db7a2f4f0841caba6037
font_01_sfnt_off0001466c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1466C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E83 11048 bytes
SHA-256: c247b953d085129eb4ec766f71fe20f2d8a2c09354ed509bb83ce4b57e2145e7

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