Malicious PDF — malware analysis report

Static analysis result for SHA-256 758b4388164e1ff7…

MALICIOUS

PDF

86.5 KB Created: 2021-08-15 06:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4f4a42a9ff28597a0f51b2d8f532eb12 SHA-1: 180d9e11177d88bbb592af9087129ad91c9fe626 SHA-256: 758b4388164e1ff7dfad0d3866ae34a00298ec2bf0f97d28d8f0ce88fdb3a267
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files hosted on various domains, many of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a link farm suggests an attempt to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://mimpiindah1.com/contents//files/84501888342.pdf In PDF document text
    • http://harasim.cz/uploaded/files/sugibikasiwajebuvafuk.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/wuvixixisepiwusuneposo.pdfIn PDF document text
    • http://wardwrightself.com/clients/863644/File/19004627195.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/zojemixu.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/4d57e1c53cdbfabdbbf355117a541f0d/14033358724.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/fefulukejovuwo.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/39702402668.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608082df5ea51---kezifipimewataw.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/54408209642.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/7t10ioem2s550hhvino2n2umc8/31651259748.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a442bd7ab5d---27937252546.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/9dbf2da71df1397b11a1dd8b32706070/norozumumex.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5dd83e9c9ebbe069eda44a4d3d86ce96/fukefibodakaxedonidimu.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/7558183923.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/ledepamobotadanuta.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/71815253009.pdfIn PDF document text
    • http://huiking.cn/uploads/file/130451474651.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/jisado.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/jivet.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610274177f6ab---9944835049.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/vgj9cjspr7kiegi5p4tniklb58/kogunusilipamixazetari.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/21b63afe44eaf294c895f22cd97acc13/73170796466.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/83594045997.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff8c5ed3ae1---lozusejuvozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=annathe+adurar+othiko+song+download+masstamilanPDF 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_off0000eec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DA 16572 bytes
SHA-256: 2e333db973c5f7628b48664f59fe87a133fd9f85d1cc6da48c3dba38c417cfa2
font_02_sfnt_off0001322c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322C 10952 bytes
SHA-256: 63c7e6e33be5ad69c032477f14e2bd06d77b069ca3bab4ff2fe633eb6f4e6798

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