Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd087207bd2aaec…

MALICIOUS

PDF

91.9 KB Created: 2021-06-27 22:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f4b5035655092f8551fa7c55b1ea8ad1 SHA-1: e8950c271662f71a95bdb568dc9fa5c4c71c1f65 SHA-256: 8dd087207bd2aaecc7cb400dc10df2d613031dd556e5031d24c2e8338f9a63a8
164 Risk Score

Malware Insights

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

This PDF sample contains embedded JavaScript, which is a common technique for executing malicious code. The sample also features a link farm pointing to compromised CMS upload storage, suggesting an attempt to redirect users to malicious sites for phishing or further payload delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nomylo.ru/uplcv?utm_term=collier+court+case+search PDF link annotation
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160793ef16434f---21816795372.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/81179970980.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/lejisolagufanenowenuven.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/vc4ndms39rntf5hqgk0h4fei41/xotogunolibuwererigapu.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a2951227cf0---jegusepisaxowolivag.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce8e12a20b---78102352573.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/juputemoxamoposajad.pdfIn PDF document text
    • http://axwelindia.com/uploads/kozozil.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/77322229596.pdfIn PDF document text
    • http://614move.com/clients/4890/File/22713667053.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609239b9aee47---furewamewakinipexulolamo.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/gojivagizab.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/76389664531.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16075ae7046ee9---3888375449.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/begabodafixoxapatewamof.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/segewid.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/86586417885.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/998d5eae9d2b2fb755649c20308ffebb/nigem.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/0b810423264f091f9a0fdeff262e0f75/63839913316.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/665825207.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/867293111fb17b19743d657da300a2b8/39210950476.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606e716f8117d---paxadurivap.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001075d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075D 16804 bytes
SHA-256: 9ac262213f773d785918d0347842eed7cc1d5360d70bac92e0fafce92c73a78e
font_01_sfnt_off000132f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B0D 10356 bytes
SHA-256: 69c7da45c760a4317f6342297f1e88b9234f04517c02efa9f0e2b0027e31eede

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