Malicious PDF — malware analysis report

Static analysis result for SHA-256 4243169c88106acb…

MALICIOUS

PDF

91.5 KB Created: 2021-08-01 23:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e7e738e0a45ced6774d143c5e3d8ebab SHA-1: 1205159bcc4ef3de8b843f3e4bab0232559d268e SHA-256: 4243169c88106acbafb585e38dcb865dd825cee316027c807b8a58fd632ca093
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, potentially luring users to download further payloads or visit phishing sites, and explicitly instructs the user to disable security software. The presence of multiple external URIs and compromised CMS upload links points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=total+war+shogun+2+gold+edition+steam PDF link annotation
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbe9e89f16---13825526931.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/guvokebumabupijimixev.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/2274587873.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/b596d8b47e8820f978d7f0e05ac27003/nesosu.pdfIn PDF document text
    • http://capital96.com/userfiles/file/lidava.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/88280128005.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/bb58d0ef7c42abb96c08f58ccbb15aec/44992461823.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/899d70cc81b748b5bb06667695b85de9/59819065207.pdfIn PDF document text
    • https://bamor.org/userfiles/file/nedawamariromatibobawela.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16070ae52f052d---pubawuguvumewaxalug.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/jalunop.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/gisodanovujumube.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bda7b019162---dagisasitutukuxesa.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/ginodapenibu.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b429cfa6f---jilutu.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/kuzekirenibegamunoj.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/4c6810df7c3a4f3ae56c0fc58f8cc8b4/kamapelogad.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/mj84n55dmt93t66222g527fd4r/vuduxekagatafikomevuf.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/132e10a7de469f740e148b1f66288aea/fujap.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/bilajogilaseraroza.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/0a548124e876291cf6629c12905ae5e6/vusevugifukigewafadoz.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/51057833487.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/jojogoloneko.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE641 10964 bytes
SHA-256: e90091ed3725ccda4cbf229ff890a3aeb277468f91d34ea6990838e67a4c64ff
font_01_sfnt_off0000ff68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF68 19708 bytes
SHA-256: f9a1ba62ffacd18cff91dfd71211d1a8dc07c037d4b4f105d800ceeabc47ee07
font_02_sfnt_off000131b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000149c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149C6 16112 bytes
SHA-256: 28bc3d95403ca07e91e0811a220ee1ecf9246f92d0c14cacbd576efc012223f2

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