Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2daf631bc639a7a…

MALICIOUS

PDF

76.1 KB Created: 2021-09-07 05:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ab78eb3785f5aae8ba7d8a84c324546a SHA-1: 9121836d427545f558756b7f36653585d1c554a7 SHA-256: c2daf631bc639a7a3c442849a38d29a72b6ed972b888e45e342c143d6b1f3128
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS upload directories or disposable domains, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URIs further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cementfeet.com/userfiles/file/47099745250.pdf In PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1612d2eb9de987---10669905501.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/jipovaxanuwuturamo.pdfIn PDF document text
    • http://123dvere.sk/files/file/bojona.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/df170e4e8bc11773774cb27f4d3029fd/purafirimiveke.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb4f5df72c---xezeraji.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/81566969608.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160967d167eeb8---39387945347.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/2428887625.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16077bdf3f0672---powufenek.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e3e0ab0aea1---92114784056.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/soxiwetubekabiguzazoso.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/4772dd348e87605f9ac6dba95fe3b219/41329629950.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/7406875743.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/171606096521.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d8b85eab9---55430211401.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fed30ca41---raporaximifuvogenazad.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/51381121125.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/31927821403.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccfbf79a62---piluvuligaxenepiguragilas.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/dirodego.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/910af71838a459080031ec25c1eb1310/dijudafavojedalefukagus.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/11042067689.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/mipevibuwapewagufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=literature+review+guidelines+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_off0000c488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC488 17604 bytes
SHA-256: 64e3aa58e80c2d4d237003cba6f8ce26e472d6796c49e36bf6c7856e746f7b30
font_01_sfnt_off0000f1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AF 10764 bytes
SHA-256: c872979661eb84ba0a9408a2d7e2d36039488c75de5c3f2b086ae77bda811dec
font_02_sfnt_off00010a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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