Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ad47c5c6d05ab7…

MALICIOUS

PDF

90.6 KB Created: 2021-07-25 06:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b47084e8c692a9f078fd70fc6285ff35 SHA-1: 9a60ff1025a7c1c8575c6692654908eb2b738b4b SHA-256: 79ad47c5c6d05ab7acb2812b7550e1c903e08ffb8eb8fe09c172b5c441cdcfc8
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm and potentially malicious content, with a high ML score and ClamAV detection. The embedded URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://wojno-stal.pl/pliki/file/75522660277.pdf
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/18185958842.pdf
    • https://directorvincentchow.com/fck_filemanager_upload/file/78443323248.pdf
    • https://angkoronetour.com/userfiles/file/likezulowiwigekis.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a145b8e0b4f---zojasaravuzonokaxotolu.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1d5379ef3---razipivotasikinexujo.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/1939125ed914f7682bfaf2201d63c2e4/gegumugogiboxolivegotike.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/2eb5a66aff66b5f1e5fd1594fd7b2be4/61921946143.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a2028bb00---zemixepin.pdf
    • http://ahcxdq.com/uploads/file/290750195534.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790bc32cbfc---gagoxumuzanoduvewapuxozo.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca9426b104---takazatimunejuwopu.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/b259df0e913d1452b2b85d6cc556dc0b/pigurirutorugejopo.pdf
    • http://tochalco.com/uploads/files/76886537344.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609c23f55084a---18597444585.pdf
    • http://newcastlehigh1967-50threunion.com/clients/43248/File/zazajunus.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5454e68f0---fezelap.pdf
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/31071980550.pdf
    • http://rotarylaspalmas.org/documentos/file/zuraforurolavojuzozetob.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/113a2352b09f997c7e6cd43bf2a07431/nofixesatudedifosoxido.pdf
    • http://architettotamborra.eu/userfiles/files/bigip.pdf
    • http://robwalker.net/fckupload/file/nesowiv.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+train+your+dragon+theme+song+piano+sheet+music+free
    • https://www.thc.gda.pl/ckfinder/userfiles/files/77995575692.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6ae.bin
43dfb5d24087c1dd4b171a0069e61d7a5acf988cbfc5bf74426161276f908a57
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AE 11312 bytes
font_01_sfnt_off000110e9.bin
d4004e626ccc2fed63110078f53c042f17c00aaa38cd9a02428b04cf9865ed53
pdf-font-stream PDF embedded font (sfnt) at offset 0x110E9 18424 bytes
font_02_sfnt_off000141d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x141D9 16792 bytes