Malicious PDF — malware analysis report

Static analysis result for SHA-256 8017279c862ab8be…

MALICIOUS

PDF

71.6 KB Created: 2021-09-03 00:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3e309a1d6fa79c1eaed21aa12790823b SHA-1: bffcf821d7f7f7e41fc1349fbd55a8d214b8ad96 SHA-256: 8017279c862ab8be04a92c92cdbb4866bb788d5f6b17b942101c025a3467afa6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and numerous external links. Several heuristics indicate that these links form a link farm, with some pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The embedded JavaScript may be used to further obfuscate the malicious activity or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://muratay.nl/userfiles/file/befivanadasuzusevomagake.pdf In PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/wemexetajowivuxenaduvovof.pdfIn PDF document text
    • http://briztravel.com/upload/files/sivemutonaza.pdfIn PDF document text
    • http://briarcliff68.com/clients/71184/File/tozekevizoputuvinoba.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/jokolebuzesiv.pdfIn PDF document text
    • https://datawire.gr/files/files/tobokare.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/c2cf722de20ffb6e73c366a0b71a64f3/77024883167.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/dopotukamedobusipa.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a080381e2aa---femom.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07b7f3d5b7---fevitinawa.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/natisifijojixedob.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/joxobowusakef.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/duwadakomagiped.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e627807d246---xugaxokomigekeminoku.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/gunurebu.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/kj8q0nqcpn3rgj2tigosq2a4n7/52094685188.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16229766621856.pdfIn PDF document text
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d28468fea4---21253819199.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/10552408391.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/gisidavedina.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb591ef490---27545962713.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/sujovubuvera.pdfIn PDF document text
    • http://hidropro.hu/upload/86489047266.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160743972c1740---bodukimatogakubaw.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2268042614---40645085117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=tnusrb+result+pdf+2018PDF 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_off0000b650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB650 10824 bytes
SHA-256: 33eb5636dd7d1a74c30109f20800f38eddf5d88bcc4e8833170cae750ae6199c
font_01_sfnt_off0000cf46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF46 16300 bytes
SHA-256: d7dac31f5efd3308a913cb1fc63e15d4ffbb049a6c667b2b283f66f851589bb0
font_02_sfnt_off0000f907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF907 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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