Malicious PDF — malware analysis report

Static analysis result for SHA-256 84198a7e3262d9a3…

MALICIOUS

PDF

75.8 KB Created: 2021-08-28 01:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8cdd10a0cb4855eec4e06fbe5075351d SHA-1: 7c4ebc2b28aa42d51eafff4e2435b8eb7f0b69eb SHA-256: 84198a7e3262d9a38c82bfa9786ac40ea9c2fc58fab6b2be4ab26f17ca8ec3f9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to domains that appear to be compromised or disposable, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://smidgel.ru/uplcv?utm_term=songs+with+a+lot+of+poetic+devices PDF link annotation
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/paxilasadadekorevusi.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/89336634792.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/bf8e1b41df79ce9c85ff904886c67f7a/43255346458.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/wutude.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/46122266613.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/gekazuvawikod.pdfIn PDF document text
    • https://adikkedua.com/contents/files/95431876146.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/32168185867.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/rawojujogixebajupanu.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/vegixobuloguverafogema.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/90038822823.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210625015650588910f6o32ghmj1ng.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/c16ed34f747742c5a44f02695fef7e7e/zowazosaponiwupezujukijap.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/topezipumexilurupamefi.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607544cb203aa---35515879625.pdfIn PDF document text
    • http://chemsdano.com/upload/files/kikatifanava.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/48085426496.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/xexumukuwugibo.pdfIn PDF document text
    • http://surtek.biz/image/files/20150215_221439.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/41095934402.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/eb133777c63154fcee53fc3073cf5bc9/94796895377.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/lawil.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/25620181767.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/rozedametumilabij.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/wuxugugelus.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210822_A2881A15008FF38D.pdfIn PDF document text
    • 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_off0000c3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDE 16944 bytes
SHA-256: 1658680a26bd2ffed0ff848b322d550738f959f365aa4b0269ec04f125fe87e0
font_02_sfnt_off00010763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10763 11024 bytes
SHA-256: c82cdfea90fa4a5b4a84f11967bda90fc5f161525d6b6d089a912c64e36f41a3