Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3643558ebca2dc…

MALICIOUS

PDF

92.6 KB Created: 2021-06-28 00:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: bb126539d1626a7b47f835548c9210dd SHA-1: 840ccba633d01f73e470e88ba442c2f743722db4 SHA-256: 5a3643558ebca2dc6f2c0645077634d5c27ed66f03ec6166a398f867f452ea20
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress uploads and other disposable hosting sites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or trojan payload is being served through these links. No scripts were extracted, but the structure and URL analysis are sufficient to determine the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://cructi.ru/uplcv?utm_term=groups+and+symmetry+armstrong+solutions+pdf PDF link annotation
    • http://jl-vacuum.com/upload/files/kixoredujiditewavovar.pdfIn PDF document text
    • http://summithigh75.com/clients/867147/File/5605864790.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/esap93ufgukoap8rq7itjmul70/ziwudujarig.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/85151918740.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/1c8d4cd5a222f58ce35d955b76bb4927/56623631620.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160717ca28df4c---17200762863.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/49adb5faf896eef2f6e8a09efee2085f/82017529580.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759259e5c75---wukikotituvifizibuwolus.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/bekikumijijago.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f75709add0---19614294103.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/45nhngl3kd7vbp4t60g1t4igt3/ravogaronijipodolegaja.pdfIn PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/15852902352.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/7h5k9gh7cpdocbb5fjsvm7u70t/gelupunofurijukuvagodebi.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9937bf7c0---34468622544.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/79b731267c163659501f4922c51966bd/62061449567.pdfIn PDF document text
    • http://abpaluso.com/upload/file/81391732526.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/91609311944.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb82b67336---lukob.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/bujav.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/41965041869.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a7fa3838---65548071413.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/69204340528.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b010cf334---95711692993.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/69ff78a9e99a2a29e210e5440e14ec86/15045128453.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49B 11092 bytes
SHA-256: 6eeda20c41fa2af4f73dcdb4d3faa52a61f81aa1576b9c74342102b5d293faf9
font_01_sfnt_off0000fe48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE48 18840 bytes
SHA-256: 9769153a563773f9b5739475d4e942f2fc852040e1fdc3383272ca845b10a5d5
font_02_sfnt_off00012ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14808 18200 bytes
SHA-256: e005dafdb9b531130268d1789e4880838c881f3be4d3ef53364c1297acd640c0

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