Malicious PDF — malware analysis report

Static analysis result for SHA-256 09e007b4cb22b7ec…

MALICIOUS

PDF

89.1 KB Created: 2021-09-06 15:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2c69ca20b3d34e201d0f27b49bc715ca SHA-1: ea8ec7cf9fa016f43e7e98e21d2a9ae9e0c599ce SHA-256: 09e007b4cb22b7eca50ab7f421b5918c38be4b9b8bb064a2d4357d33da9ffb6e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to multiple compromised WordPress sites and disposable hosting, likely for SEO manipulation or to distribute further malware. Embedded JavaScript streams are present, suggesting potential for executing malicious code, such as redirecting users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/7b8881c78d86c8ab38c6ee41c2e5d3a3/42145380157.pdf In PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/nuxirowiluv.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/30628266458.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/9244604324.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/51912602746.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/47023328781.pdfIn PDF document text
    • http://pcwest1980.com/clients/9/9b/9b13e9c1eb96aaf026ead536bb80a376/File/pimigoxonoregi.pdfIn PDF document text
    • http://nensi.si/upload/file/jitiduvopisujuf.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/9a99222e97fb7146548f201d28777b2a/rakoronitanu.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/lumeveguxo.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/sutozowumonilogo.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/9c1411f498781240b3bdbe874085a613/66288781893.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/wugezululob.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161142c8ef0074---sabatinusatamukomewugigub.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a301c0e7470---wewonugokafesajuxojarotu.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/33ec9edb32c46d8fe8cd16ed56bdb998/13100584821.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/f3a2f8a2e259930c77ce7390f523e78f/87165898648.pdfIn PDF document text
    • https://malikcolsys.com/userfiles/files/puxuvivam.pdfIn PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/pixidamituganadiriposa.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/qn9s4pnvt89904ujcls0ou5dvs/16016675349.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb7e74494c---suxila.pdfIn PDF document text
    • https://hanul-muresenilor.com/wp-content/plugins/super-forms/uploads/php/files/etgtn34rnkhdokd7mn6qhhmgku/zinujebilapawuninariwa.pdfIn PDF document text
    • https://patc.fr/imagesfile/79000653077.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/38195864367.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=university+english+literature+essay+examples+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_off0000f79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAF 17356 bytes
SHA-256: 27cda6cf7186d280bf282b21a3d8858d00ee3ca25a8d1ec4bcd9b3a407fd0153
font_02_sfnt_off00013c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C05 11212 bytes
SHA-256: 3fe91cf73d0929cc1a05eed105a8601508405dc2290d95507a38244d9aa7bf1c

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