Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c6326eb6100833…

MALICIOUS

PDF

74.2 KB Created: 2021-09-15 18:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 802b4381bc4d0fdc81fb2dbe00ea80c1 SHA-1: 12ec14cf4c4d1a7b6f7b367cd18ecc0437daa985 SHA-256: 57c6326eb6100833f012fafaa106b80fb23c8aa68eac728cc661359716e19660
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating a strong intent to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chcial.ru/uplcv?utm_term=windows+mobile+and+android PDF link annotation
    • http://waycreon.net/bhaskar/yii/upload/files/mimatolazibope.pdfIn PDF document text
    • https://venus-forever.com/image/files/17527256137.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/1037554557.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/8655549796130d1372b543.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/96682895488.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/16687085945.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/sewekuxiniz.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416a97524a4---96189941913.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130c4104a4a9---78600624400.pdfIn PDF document text
    • https://network-italia.it/file/23180930466.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/70786395560.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/maworibelu.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/ruropifirimofufolali.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0c04b7251---92963568982.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/54871290055.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/54792701004.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/woratamokijiri.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/pajilikadezawop.pdfIn PDF document text
    • http://kustari.net/userfiles/file/6225530413.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/mitowi.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/mediwatigakedax.pdfIn PDF document text
    • https://limadelimon.com/images/file/jagoj.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/93189742197.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/83216584040.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/74930588184.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_off0000c0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DA 10528 bytes
SHA-256: 18451d6f30c1058c6519c7ac3504f4f8b25e4521f0fcef8f434fbf06595447e9
font_01_sfnt_off0000d8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DC 16384 bytes
SHA-256: 0d1bbb93028d320ecf272201c25b678bb82e19d999567184b0799c7cac435627

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