Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cd4c54ceb4803bb…

MALICIOUS

PDF

64.0 KB Created: 2021-09-14 13:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 78e1c483b30a32767e45c61b320904e9 SHA-1: 2a48092499b1e4393a2e39430a1bc377bcaf1a8e SHA-256: 8cd4c54ceb4803bb2ea0b26d85d8726bb3268a016c017b31b6676261e41b1769
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6968

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://philabc.ru/uplcv?utm_term=reaction+of+alcohol+with+socl2+is+sn1 PDF link annotation
    • https://pesonabali.dswip.com/ci/userfiles/files/jelijunanesubesakog.pdfIn PDF document text
    • http://seritour.com/rsm/files/pekatenevef.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/3f815f9de594977e8ff33f76c9edeba7/18841381664.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16131c68002763---89998687101.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/garaminixikurififafep.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/90088344443.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/44155867558.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/gadowatagej.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/fujidulivipipunavigoxoto.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/70486384752.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613430c83395a---wuliwadaboxigemivuvala.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210908_A9FBD0B3B13BCD49.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1612fec9863f55---burumukofi.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/bapokuse.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/pititiwomawisojitaser.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/mademagidos.pdfIn PDF document text
    • http://adice-area.com/pictures/files/zewizuwodijaxib.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/18087778246136bbbadd157.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613237f5cba9e---munedawekidi.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbe449041e---lodiluvatamokadomidav.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/posiduzivikigovu.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/xulowufadodinogamud.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/51090746876.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/4ec63fd7a3169ba4206a1c0db2e4d8f4/suxemesojalabebokeber.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/7200947474.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD583 17352 bytes
SHA-256: 5c4cf90fb9854dd3dc33744acc54dd77384b253a8ecdb200b24037e121323414