Malicious PDF — malware analysis report

Static analysis result for SHA-256 8193927df514fa83…

MALICIOUS

PDF

80.3 KB Created: 2021-09-01 22:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 66f00a0c21fa55b6b0ec0cf0eb255f1e SHA-1: 70ea9527f5b22a506c8213434c18400198a98ac0 SHA-256: 8193927df514fa835df3bfbba035ce93780da186c6b37d556889d13e905dc894
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9798

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://smidgel.ru/uplcv?utm_term=cluster+computing+in+cloud+computing PDF link annotation
    • http://fujavietnam.com/images/Download/viloteda.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/joviwijelitezutatukuparuf.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a637af05677---90717658909.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/56404548627.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/bilesazirewalilevokes.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b5bf9d31f---zuvezujusibudoto.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161190715e9f36---mipedirulik.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/rjf4c1p41gf8o6jgc05to1u95f/tupojokerevitotorafi.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/83632164789.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/dijuzubef.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/qecf0ml2i9a2ic4mrfklvfhhho/68744043052.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/fof8201np1gp0e2g79qj2d65sv/kaninagabedotirukupo.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/15005224950.pdfIn PDF document text
    • https://sambelteri.com/contents//files/13161764924.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609077124dc93---lagajibogesurewudunadit.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/5724338389.pdfIn PDF document text
    • https://rotherelectric.com/files/notol.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160be0fe821d8d---vumepobojusupo.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/bulofoludukomum.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/viwukuvirugolin.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/vorazisigogejokilemevaka.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/301245158352.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/kogowokidamer.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/dinazijamakudipuxomog.pdfIn 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_off0000e282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE282 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA99 10824 bytes
SHA-256: cfc820a239fd7b714c9324189e4186aba680720f46169e5c761376f7672b09d0
font_02_sfnt_off00011358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11358 17404 bytes
SHA-256: f8c3af1e1af9d93915cd7785177dbb451a3d7365f686f87d1a55a5924bf76ab2

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