Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a69eb4ed7332d55…

MALICIOUS

PDF

117.8 KB Created: 2021-07-12 22:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 412212f5c0324f97c2958f18855c661e SHA-1: 233a54bb30d3904688bb19642cefce1f86117125 SHA-256: 6a69eb4ed7332d55147964a1780592be10abbd3e60ee31be4129a914e7e3ca5b
156 Risk Score

Malware Insights

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

The sample is a PDF that functions as a link farm, containing numerous URLs pointing to other PDF files. Several heuristics indicate that these links are hosted on disposable or potentially compromised domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9676

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://hometeamcorp.com/images/usr/bilidesojowijorajelupaz.pdf In PDF document text
    • http://casaalu.com/luutru/files/wonesenumusiwoxuwojatefo.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/nejusigexizev.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/anj9ijqm6kgb4fjtntav398v93/zidudarikisuturiwom.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/79389326687.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/lutasidapofa.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/wozizudabo.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/e958bd10634883070da438940b43140d/59618915758.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/7j0l0fiibd2r3hjpdacov7jmoc/xasewezavitoxe.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/a63225fbb9ff5378ac27b785d3609665/vidomujiwiwazaw.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/rkmb9uolfdbnt6ved9pmc4c224/radoka.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/novatoxuwisitibopepe.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/35653371002.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607235c89712c---nitufabovovezoduwone.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/32146631440.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dde1a36adb---49400893996.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d8d4b2c3a---17048843414.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9226aa5ab---48752267752.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/rikilusuxukuropupamibedi.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082e9938efe1---fumojofokiboroliwuveluno.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/93894198791.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/25116588949.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093243958ff3---norudoputirawutonure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=knew+meaning+in+kannadaPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000137dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DD 23056 bytes
SHA-256: 6125728f3d56cfbdd31b25cc507d4c72964fd8d42365ceb336b4b1d8dedfe1a1
font_01_sfnt_off000173d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173D5 10228 bytes
SHA-256: c6257912b020c08f27901d25cb2ce801d3052a3f9bcbd7b37b543a399992a416
font_02_sfnt_off00018a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A7E 3952 bytes
SHA-256: 35f02408463b38aca8375b5b97e1da8ba4787dbf6119a4bc1006348216f408da
font_03_sfnt_off00019a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A21 16380 bytes
SHA-256: 17b87d0f4788fb9c5e473077691e6af3df6af9e149d4ab8e726f50a0ce6c0b03
font_04_sfnt_off0001b0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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