Malicious PDF — malware analysis report

Static analysis result for SHA-256 877f85b38f5db183…

MALICIOUS

PDF

72.7 KB Created: 2021-06-27 11:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ed9e9ea8e46dac4d43883f5528e9ddde SHA-1: efab7f0579deecdfd730782bc12d5cecaf3d7ea1 SHA-256: 877f85b38f5db183c2ba4ccaf43fadd018dda8a903880d5113fe3c45ad1f6ef0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself does not contain readable content, but the embedded URLs are the primary indicators of its malicious function.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://chothuexehochiminh.com/userfiles/file/65435733727.pdf In PDF document text
    • http://citra.cl/userfiles/file/71798717143.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/tadokawegalanoxavu.pdfIn PDF document text
    • http://parkwaywest1974.com/clients/861606/File/narawadejawo.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084872e6fecf---94696790838.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/777102a2a6418a39ace61ae7675e9a70/medowuj.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/jilematupekefirape.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/jaxedusediredaxifogevuno.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9c6bc4fc5---52849507140.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c50dfa2f12f---geziki.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a950624d6---voxavadalowobosojejo.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/ruxiwobak.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/xumuwagoxirezepad.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075b89571f7b---wolafobofekizizuvasati.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/aiq597f6am4ki91lguonhl5ua2/jikosapekuwanonugonate.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1bb6b75b0---82407163438.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/76354116313.pdfIn PDF document text
    • https://abeess.com/userfiles/file/pigigivubavidut.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbbb8abcc2---71603467546.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/zisowado.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2a17d2f84---40676968810.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/kapaborezonegapitile.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83e4a78535---27571033412.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/23d106a41b48b2592994b7d55b6f1cf0/25342691638.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/dd7954e05d549145c75cb869c24f1e5e/batekekadasupite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=12.3+surface+area+of+pyramids+and+conesPDF 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_off0000b9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D4 11164 bytes
SHA-256: c2d59e1f9d55a3ecd5f042326d60bcd122daa22e0a82871e69565a20703ba8d0
font_01_sfnt_off0000d406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD406 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC18 15980 bytes
SHA-256: 842b7af802b3154b655354f1e25c68fb198c4503aaab379bef4e7577c917cc50

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