Malicious PDF — malware analysis report

Static analysis result for SHA-256 495bd7ac9889b752…

MALICIOUS

PDF

77.6 KB Created: 2021-09-04 06:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 59f1683368e6d5071605ee6897724456 SHA-1: 9d2f53bddbed5fc18b4b4f87e02b5c8b6537447a SHA-256: 495bd7ac9889b7522b06c824b02eb4b3d42fd40175a50d1abb3f7c765373cafd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicate a link farm designed to redirect users to potentially malicious content. The presence of 'utm_term' parameters in some URLs suggests a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://ketchas.ru/uplcv?utm_term=money+hungry+sharon+g+flake+pdf PDF link annotation
    • http://wojno-stal.pl/pliki/file/52873359790.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/94713787789.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/rupisazuvapedalajoribaz.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/kulorotazemufavisiwebure.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210727180426.pdfIn PDF document text
    • http://ace-pharm.com/upload/files/61106353265.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c68f11f35f---majitaxakulotorod.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/tifuzirinidifadaxukiwa.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210529_45C7CAE076AF4A9A.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/fadizolumugula.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba6b010082---27333696763.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/408dd0b2efe585fa7334fbcc476ad700/1316959270.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/86431422844.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56b9a4cd8a---74601825622.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b51ac62a256---95335942108.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/92234141062.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/e668io2hpmp53dqrq17q09dlop/22362037329.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/97022266810.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/kanaf.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609629f02cf84---siberegukutugogibek.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/lugirugeso.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609303e34f273---31017560856.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/86633525427.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2736b20aef---45934677748.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b53461c386---13370258025.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_off0000cc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A1 10888 bytes
SHA-256: 149bdaa7bd192489039605afaf987824f6e16df126de67cd2554b6471e11b9aa
font_02_sfnt_off0000fd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8E 16728 bytes
SHA-256: b3e504fcfca899290cd612f5189783f9cb1ee6bc0a4497a6c40c1d51b67ec8c0

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