Malicious PDF — malware analysis report

Static analysis result for SHA-256 340624ddb950d9cc…

MALICIOUS

PDF

102.8 KB Created: 2021-08-10 02:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 12e7caa8f179e8577a0d4a2535733b9b SHA-1: 2d0a48e07e55fc44237c932ebf65cdc610378f05 SHA-256: 340624ddb950d9cc735318a63abe762af9ea028a9ed416716662c14d8f243679
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. These links likely serve to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://rzn-house.ru/upload/file/22559500556.pdf In PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/668b59015c905ddcf0f35082c1dac478/79110233040.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/kafuzi.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f693e8f12c---gelajukoxibewinisusa.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c32afeabd1---jubugokabifazuvoti.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/332d40d52db0689492ad97f2b59ef776/33992650911.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/dixepewupizagolo.pdfIn PDF document text
    • http://flirdining.com/uploads/files/12319124861.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/dulegavagezaputokaposajo.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/piwojuwaruziga.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/1768658721.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/66212318354.pdfIn PDF document text
    • https://lymfologi.se/anvandarbilder/221/files/80700936001.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/54257571414.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210719120933.pdfIn PDF document text
    • http://mebco.ru/images/file/37101890216.pdfIn PDF document text
    • https://bamor.org/userfiles/file/63334640423.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/c91be6cfa58ebeaf5ad254c609a940ab/87987667527.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6423f2a57b---79219652434.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/leginajewuzuvazoluzu.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160fbaae1e2db6---redibiru.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/nexatemilim.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-31/20210531083109952486.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/budigisukifa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=libro+de+botanica+general+pdf+gratisPDF link annotation
    • 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_off000128e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000140fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140FC 10892 bytes
SHA-256: cb3c332ff4be9f52b5d5d004235d2a50d0101bcf4bc990b8c7db7846b8f7c1d5
font_02_sfnt_off000159dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159DC 20228 bytes
SHA-256: 9483579c5954e4e419e5200293df8a7073f35fc23b250cbd23671b8933192f47