Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d53533b57cecfc0…

MALICIOUS

PDF

87.5 KB Created: 2021-07-30 13:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e9c685ba979773062fa796a3b8b5d9fc SHA-1: 3a5cb1c56239c9267a59cb8922f7ea1ab34e2e62 SHA-256: 3d53533b57cecfc09b1249f959b4d4e58c12d62aa7581c6e1347ad7c0832e73d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to compromised WordPress installations, indicating a link farm designed to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cccd907f572---39836326951.pdf In PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8776c380a2---12924120554.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160752abd8eef4---fibikin.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/dpf6tfqvi3rchksi32hd1v2g67/60561123679.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/4800080698.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/ec48e025b6400a545d2f4e101c84ad42/19556027910.pdfIn PDF document text
    • http://orhs89reunion.com/clients/77823/File/48421570602.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/d37f7ad3cbc9ec94d119c3a6a89ef485/vojonekon.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/favevimalubifavaxojise.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d0db24e72---sasok.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/9lpjg3egr6s352uh01elhv1nen/29235141481.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/vf5qs7gj7k3cd0ff34vucbdvl9/pigamewoz.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a8fa8d29f---xeterapelebipitesugifimu.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/givejozavoko.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160be4aba63610---sojafowevusajerapaletexof.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094c9d2d4ae2---82139112036.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210627162482513397.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609983f9864cb---bezezatolilebiriwubife.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e373bbfc0510984766ae4cab1f84fff6/72387002619.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160772ba3a5be8---96383977196.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f21a0f820e1---86043167221.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/xobogipulep.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/tujogawosuwudomubumed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=dna+and+genetics+worksheet+answer+keyPDF 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_off0000f2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEF 16796 bytes
SHA-256: fdc04600d190fb6ac6b9e8c1067a91f4747da22ee6ba2f2f042f8cc03af8c485
font_02_sfnt_off000136ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136AB 10896 bytes
SHA-256: 92574e22075414f8adb4a8474cb51ec3fdef6696d960d36e928f19303789c00d

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