Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c6447ba716b460b…

MALICIOUS

PDF

68.9 KB Created: 2021-09-05 04:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 621ec7d5c8e5532f63e5ce5abc5ad13f SHA-1: 011956525314dc55735132497253a88da523a91a SHA-256: 1c6447ba716b460b57e70712220446787531ba2352cec267730433b6d7f16ec2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics point towards the document acting as a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://smidgel.ru/uplcv?utm_term=define+on+the+job+training+pdf PDF link annotation
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607837e4c964b---81981528901.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/65781854571.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/808c701b64f48829c4cef789659151ad/86731640055.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/12599106945.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/41081932379.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1610392b7833f4---39844191902.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090121751f68---72694498501.pdfIn PDF document text
    • http://princeton1959.com/clients/863834/File/giliminuziv.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/26355053751.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160960615667de---76037147479.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160838c6aeed76---foduzuxupesidebudu.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/51998103965.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/vatilika.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a0581369b76---degokinijib.pdfIn PDF document text
    • https://transit-connection.com/userfiles/files/80285943232.pdfIn PDF document text
    • http://lagrupacio.cat/file/vimetasapidipofiwanovu.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/10576975215.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/88906717234.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/dikiboro.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a28bc8c98fd---47258390361.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/dbb7f5f53c5db4a788ef5a6d5414485d/xusene.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb1543782c---50411005890.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/40037556840.pdfIn PDF document text
    • https://limsurdua.com/contents/files/paxobikedut.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_off0000b2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AB 14264 bytes
SHA-256: 4782826bb24948cbed6a242b686aae59eb65d8fcf48fc6d750f07bed5138b8a5
font_01_sfnt_off0000d5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E3 10832 bytes
SHA-256: 8fd19e012a8f38047e7dc50ae43c7c8cc62167c5ca1e6ca173188723b98fa057
font_02_sfnt_off0000ee51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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