Malicious PDF — malware analysis report

Static analysis result for SHA-256 e234c94c586046ab…

MALICIOUS

PDF

91.1 KB Created: 2021-08-12 05:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 88de4ee38a66bf0211ecc895bbd03176 SHA-1: 1c35daf6f5a1117f565a6b02bf0eaf197e50b25a SHA-256: e234c94c586046ab2eabafbd2b8aeedeec271d1d47c23687e17a05364a71f6fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely to lure users into downloading further malicious content or submitting sensitive information. The PDF structure itself is not inherently malicious but serves as a vehicle for these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://apsara.ru/userfiles/file/dobiradotomavoxabu.pdf In PDF document text
    • https://agrimal.pl/userfiles/file/83094461961.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/59734320754.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/b64baae82705ba9a18c8c98c1b4a3561/44066878608.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/usqktfoia5j3brtq2rdht4jrub/84855057625.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/4173b370ef9f04b8d23510ab7e8087ba/9829420771.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160719a09eb376---jurimodimuwem.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e4f028ebc---95438651069.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f17a7be513---taforenetudatimeviwurorok.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1609af621d9b8f---52647064555.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///11484968363.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/fixinevazorijulimowa.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///78733347481.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160837369ad699---piguwewimemop.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/revowerejebirim.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdc44d58b1---burimudupova.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/kozokoxaxutizituwolopi.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/32b692b5acf30ed58147e5c878d9b907/gotezu.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021052706004873499.pdfIn PDF document text
    • https://apizf.org/public/file/62542858222.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/nowuf.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72657226426.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/zuroginovotituda.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075cc8678a23---bulobijeno.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/95597662934.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/nanutul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=full+hd+print+bollywood+movies+downloadPDF 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_off0000fedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDF 11140 bytes
SHA-256: 73a44aa11236847d54b30c2dbcb32a9dd375c3a2b095e4861fb2b823351fed7c
font_01_sfnt_off00011882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11882 17124 bytes
SHA-256: dbc08ed635eef26d0f00aa1c7ee10bc891a61d2d4f9a510b09cff17349f165af
font_02_sfnt_off0001455f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1455F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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