Malicious PDF — malware analysis report

Static analysis result for SHA-256 93fced73cb4babfc…

MALICIOUS

PDF

77.2 KB Created: 2021-09-08 17:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 131abe6afd5052a85dbe16be36a7b605 SHA-1: 0d76f50cbf7cb6e8cfcdc89d4c5d2355bb2af068 SHA-256: 93fced73cb4babfc94a77e1d7b7c7f9f6fa13f8673be298cbe73025a1ae8c53d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing an embedded JavaScript stream, which is a common technique for executing malicious code. The PDF also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, indicating an attempt to distribute further malicious content or conduct phishing. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.waetsukai.jp/system/ckfinder/userfiles/files/64598167500.pdf In PDF document text
    • http://pspectr.ru/userfiles/file/rodilo.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/43523758218.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/161389aab43b84---58146959679.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/22424299071.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/28183987632.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/84019818237.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/megebiburivuvina.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/novojizuzijotijubixizala.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16132605e76236---34479410800.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/75074428541.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137debe25ce7---wurizuz.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/43762909385.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/nerosurekuni.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/fejuletozijujututafubita.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/a3a53cb2e6a7f94e504822cf2f632bbe/fuvawagekixufikifo.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/51432599525.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136c580e6579---68288341120.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/pirulusidobuniripoje.pdfIn PDF document text
    • https://fuoriscena.eu/file/81221093358.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/vajunorilufijanimavefivu.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37977536135.pdfIn PDF document text
    • https://izometal.net/mm/file/tapomigigokomufope.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=correcting+sentences+5th+grade+worksheetsPDF 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_off0000cc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43E 10948 bytes
SHA-256: 939a3dcbfb9b5b2eab30db1c4ad817aab1cea4ee285402d3cd608181d7020b71
font_02_sfnt_off0000fd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7E 16096 bytes
SHA-256: f99fc60fdc35b075aaf418faad5f64bad042da4943a5dc1e6e10273a62e34e7b

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