Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fd3128d4700ef39…

MALICIOUS

PDF

72.3 KB Created: 2021-09-06 13:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ef801234c343f5baa1c0cfdaeb658561 SHA-1: e8002e27f149e731bb13a5b78915cb19ed16b9e6 SHA-256: 2fd3128d4700ef398212ea7b8fdce5e4a4afe9aade700ed479db9647c77754bb
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous embedded URLs, many hosted on compromised or suspicious domains, reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://acunambalaj.com/adenoto/upload/files/lakijige.pdf In PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/vvbd0q9e70947kdulcr7ap4ts6/14944428693.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210723_09337CD2EFE81972.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/cf82e1794cab7d9cf2056f6e259699e2/49394968825.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/pesef.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341b09c3ab6---dovologowew.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/75140406457.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/18576337463.pdfIn PDF document text
    • http://meyras-tourisme.com/ressource/site-image/files/lifuwit.pdfIn PDF document text
    • http://abpaluso.com/upload/file/25975691873.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6///20216291643548041.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/tobabezagumalijorodiwa.pdfIn PDF document text
    • http://pinetreerealty.ca/clients/55933/File/8575088481.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/kudemiwuliru.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/86488279589.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/vofuloxabi.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/wozifu.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/5lmsgjar95gppfit1837k2gbk1/zevemasikuguxifudajar.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ae995a275---63372197492.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/nanarevepipazor.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/purepamifirup.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607caac83f993---84887212199.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/62539076151.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=criminal+law+1+reviewer+pdfPDF 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_off0000ba28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA28 16392 bytes
SHA-256: 96f2e3d9256e9058cc0889454e352a90e5c33502a60aae2f135d82f6eacde6f9
font_01_sfnt_off0000e3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3ED 10508 bytes
SHA-256: d9b5d42d8c01c9349820891ac7b0867cf5ed09193abc7c1190eccfc6f1bd2452
font_02_sfnt_off0000fbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1