Malicious PDF — malware analysis report

Static analysis result for SHA-256 58c4281c197d0270…

MALICIOUS

PDF

123.1 KB Created: 2021-08-17 01:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 7d5ad8a9497cf3545c200841aeb6945d SHA-1: b51dab7af3f9c235bc20ca57cfb07d3cd3d826a1 SHA-256: 58c4281c197d0270859c8ae04d57c0ae07b88d2ddb252a300f66ac9652d07dfd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://crysiq.ru/uplcv?utm_term=donkey+kong+country+1994+download+pc PDF link annotation
    • http://eatatrudy.com/uploads/files/2829595089.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9aef9b7dde---xusanazokenug.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/13794474871.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/rexepowakuni.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/92960284329.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161075fef9e2ec---molexojuwijovililaxobezar.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/e1cde1b12b683ffb77188353935e76b1/42149276314.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/ponilisamubo.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/juziretaleviva.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071ae6bcc149---befajelopikutajelowepada.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/ec7b259024a5d1a2dda7ee4e9cbb32e5/12811211324.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/60555731904.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/15139759688.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/18437875286.pdfIn PDF document text
    • http://chipgene.com/image/files/20210710_050113.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/kojexenepolujimimosumup.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/38186116786.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/dka3ql6vu0jgdsamtknmrecqib/85478668308.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/nisewemofetejudufip.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/lvutoq3fakp2upgnf7eb9lb7ee/tawivejolugewib.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/68824510683.pdfIn PDF document text
    • http://akademibt.com/resimler/files/labukosuve.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ee985e39fdef42e24df950e1262fa50/xidezit.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_off000173a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173A3 2388 bytes
SHA-256: 2f653eb6e82ae4616b1c7444051f52e074a025f86261a3f35dd2f929afbde6fc
font_01_sfnt_off00017e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E38 17324 bytes
SHA-256: baf233bfb9b464d3694515b81f8e3f6ef612810684aae0b7ed7c183737a7d92a
font_02_sfnt_off0001ab1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB1F 11120 bytes
SHA-256: e811b22f029fa1a980d4e0a980655e062fff8489462e435e2286566afbe15be7
font_03_sfnt_off0001c538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C538 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.