Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b128520ad63ff46…

MALICIOUS

PDF

93.2 KB Created: 2021-07-13 23:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: afa2b0167946dc5d7d2260ab1648e697 SHA-1: b5e320978765ed239b4952ead8a4acd1c320528a SHA-256: 5b128520ad63ff46e0182ca56dfae23c79f29dcb443265f99e1f992bc859de10
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classification strongly supports maliciousness. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://o-dance.com/upload/files/73690170678.pdf In PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9bc703658---xopilitifakipugi.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1378499a69---numosujexopibopefesi.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/2cf586b9ae2edb49a5f9b79260ed0241/86220382175.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/44535752587.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2279188ea4---soredomofo.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ebet.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb40ad35865---93453156959.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa693a8634---58654727707.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/lerevibejagetatulujilovaf.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/0uuv0pg3drltfjuqln3tctm199/16238661895.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092537b22d2a---58610546937.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/tatikel.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/bukojoguzoj.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/e872a35bc149a69452d9b25be774788f/sarujevegudib.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/31412450707.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/9914423206.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/95194305048.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/d8908cdc8d9a335625ea89b6487ebe0d/88558795045.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079aa1798362---wifavifirit.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/d2bc4e0a85f9aa85f2a40db423edb9e5/14634157726.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16098c664a5b02---fuvekajeraxoxofabirufuw.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/67816325009.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607836684c328---naxepozuge.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/tog59dbtoqugiodqrphlt0pqpj/fudipidomiluso.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e726e91267---moxuvijajiligej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=define+physical+dependencePDF 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_off00010781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10781 17668 bytes
SHA-256: eb7e5385fae1c36cdbba054d06b7b1c5b338c6a0af81910735ca05b5c9daceb8
font_01_sfnt_off0001364d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1364D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E64 10512 bytes
SHA-256: 76acd21ef1fe87f6af426d8bc681c93d45036ec860cf82ef6537b6bcffd8b630