Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c9087d807cdbbb…

MALICIOUS

PDF

108.5 KB Created: 2021-07-17 03:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 84f86e9d2739c4b03973186f5e2c0c21 SHA-1: f10fa984a278b89c7369d801b248a2efcdd0c07c SHA-256: b5c9087d807cdbbb09a86ef1d3e5bdfcda98db7d90be352aeb6341f66ef68798
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to various domains, some of which are hosted on compromised WordPress sites, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://greaterdeliveranceministries1.com/clients/61527/File/6111555977.pdf In PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/mopederename.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec981ad9678---bazokikubibagobojomat.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/zasanodaju.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe188c94f2---73563068948.pdfIn PDF document text
    • http://allasclub.com/campannas/file/zegemalogotujukobokife.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b73bcd2dd7---34896924459.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/delekowosoj.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ae5ab2682---falosotefapasaremej.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/pezodejoviwofojemajut.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/taruxakejuvewotejube.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/43130756871.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/velafusexase.pdfIn PDF document text
    • http://ahoba85.com/clients/2/26/26d353b61ac95a99d7df5001a3d58300/File/xuwuwojalikovavedowamad.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/81fe8c7e3894b09d0ce0db2c46ab4b50/71950551312.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba0774a3cf---20075753259.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d396cc3221---61554207915.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b61153a1f3f---73730679867.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/5faab21d3c66723b4d890fa1fc1c9391/84098660812.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/vatajuledejupapawase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=poultry+industry+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000137dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DC 17788 bytes
SHA-256: f242c280923698fce21ef8421bfc19cbc8106eb8c122f51aaf4067596e3c09b4
font_01_sfnt_off00016662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16662 10412 bytes
SHA-256: 1ec1cb0450538355d617be2b43f4e3eb4f802a4156dbbfce0bafa3cc4309ef84
font_02_sfnt_off00017e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E11 3992 bytes
SHA-256: e8cd3239030cae8fdcb92edb5d569903b61f1b0926bfa5bef468889e8d7e5ea1
font_03_sfnt_off00018cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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