Malicious PDF — malware analysis report

Static analysis result for SHA-256 59ecde65e1a7e729…

MALICIOUS

PDF

89.1 KB Created: 2021-09-10 16:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6d116f350aa870a86530259da46fe7e7 SHA-1: 87d426f02640929a04e4fdec5be282558d257ecb SHA-256: 59ecde65e1a7e7296060bdf47342aa09b1d85be61406549079e32a6c5b494206
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 compromised CMS uploads and disposable hosting, indicative of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are common for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://synerhu.ru/uplcv?utm_term=cara+membuat+teks+bahasa+arab+di+android PDF link annotation
    • https://holocaustresearch.pl/nowy/photo/file/logefoluwowaga.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/64b9f4b544ccb898a3cae61c8e992406/91378844879.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/37204540795.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/77541443977.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/xogepezuxogugi.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613600eb8b8eb---62334123302.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/jrknio60c2uqkau9tlscmtfjpu/89515646052.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/90765209115.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90740766289.pdfIn PDF document text
    • https://onlinendttraining.net/files/16341649351.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/tejowukariwumamonava.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/vpo8vqmrrapndaq8a3eblofaco/48901066297.pdfIn PDF document text
    • http://lovesenergy.com/file/xilotezasawukafazofoz.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381b4bcd41d---61257016686.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/38176989363.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210908210219.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/2666813135.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/wotagizulijobobenuxukolaf.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/8kvllempe8ir4mjsd16cu0s3b2/65010644909.pdfIn PDF document text
    • http://elsped.hu/files/file/74590478184.pdfIn PDF document text
    • http://youil.org/userData/board/file/kukux.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/5730939732.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/mosat.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_off0000dd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF596 10828 bytes
SHA-256: 784c5d67b64ad6e89f0ff83704cfa2ccf14dd40163310c886e9a68eb5360d803
font_02_sfnt_off00010e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E62 17868 bytes
SHA-256: 008d51ff385a73e70344c0e73fbc7201d64370fb2b727adf6b51f62075d76fdc
font_03_sfnt_off00012a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4C 16712 bytes
SHA-256: 7a421f2408f7b47cec868a2a69a5841bc66283824f3ff7abbff5356bca3310ef

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