Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d1c0a8de36ae9e…

MALICIOUS

PDF

83.0 KB Created: 2021-08-23 12:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f65a8cfa708996c5b2f0d208be02185b SHA-1: c6215e2d5e93bf0f0e4bade3916585717d209044 SHA-256: 51d1c0a8de36ae9e57d24e573b1f6aade2cb30e629c3a53e0a1174d768367f4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://chcial.ru/uplcv?utm_term=chicken+marinade+for+curry PDF link annotation
    • https://darkoyunpin.com/calisma2/files/uploads/jixosawutopemuteketiw.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/22059884389.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/supudupukuxube.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/tumegizotigun.pdfIn PDF document text
    • https://2acontractor.it/images/file/65703541040.pdfIn PDF document text
    • http://scan3dsaigon.com/upload/files/ladojavumosigutixesi.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/73994827186.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/jefiwoxijemupubagusexajev.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca019bb5aa---bositotixawadox.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/3d39198e81c88fd2ea1e6c91f86b248d/zijaz.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160751acf4cde2---1613245834.pdfIn PDF document text
    • http://bvsaigonbinhduong.vn/uploads/files/baxenefes.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/e9be3a487399bb78bd9c3a5e564e11b3/11882544652.pdfIn PDF document text
    • http://maxkbm.com/clients/2/28/28fcaa936e2ecbeb6c9a97ea0f1ab253/File/63948120660.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/d258907aa95a20d5c9e8a70b8e529915/nuxis.pdfIn PDF document text
    • http://stringpoets.com/userfiles/file/tixuvajoda.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa0eea2c95---56997795490.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/e96f31ab0b3de8c2ef1076c51728859c/duvojasovezizubusox.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/4962342921.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612359864bd51---libunoridego.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/k1mp64p8279e33jsckv04u8s1v/3045170861.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/gepulifasolubi.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_off0000e1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AD 17032 bytes
SHA-256: f2ee1b101e30a1270be1b12526ba871a826797883d32a7dca8d9961d66001a5b
font_01_sfnt_off00010e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2A 10764 bytes
SHA-256: 950ec6b52ea81d589da3136a45c46bfd7a9805e69f0fcfec988d7022a229fb5d
font_02_sfnt_off000126bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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