Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f95189749dbb3a2…

MALICIOUS

PDF

64.0 KB Created: 2021-09-04 06:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2c6a817316b4df2f1916bc4186d3e4d3 SHA-1: 7e16d3f3653fd2b051469c7adfde7330ea189919 SHA-256: 6f95189749dbb3a29e4f7aaae007d0478754fc8b57da7b9c69d0fa31c06205e8
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics identified the document as a link farm, with URLs pointing to compromised CMS uploads and disposable hosting. The embedded URLs and the document's structure suggest an attempt to direct users to external, potentially malicious, websites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6520

Heuristics 5

  • 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
  • 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://crysiq.ru/uplcv?utm_term=manual+de+terapia+intensiva+para+enfermeria+pdf PDF link annotation
    • https://bonacorsi.it/file/83554193068.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/leguxijuxuvimur.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/52898233607.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/85199984239.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f0a90b401---ledowomaru.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/jojukawirasodajonakoweva.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/zumowubavapebenatilafifi.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/biguberukaragurepora.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/temalijusizarex.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/38226792860.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/gapigenebedegirirerogar.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/rewideno.pdfIn PDF document text
    • http://proxima-design.cz/files/file/30681706505.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/sebogodibepemene.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/dawez.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210830_53DB28C4E1414E51.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/nunuwigoripem.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/tboq1qi2dnh5rui9h2bg268av3/16154604370.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/98690967750.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160d21372587a5---lodada.pdfIn PDF document text
    • https://bem-sa.com/img/file/48410230200.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91acf56d01---rijidiw.pdfIn PDF document text
    • http://asfalon.com/__files/file/18442337488.pdfIn PDF document text
    • https://medpressa.ru/files/file/zewitidu.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_off0000bd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD5B 10696 bytes
SHA-256: 47a24f6cbb0f2984f51096e2ac327bb3c7bd4e3cfde30052627f6f7702d6b50c
font_01_sfnt_off0000d5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D8 18556 bytes
SHA-256: f8f4a8367e344c1b6692eb13a125af5c9276feb27ef5846dce5560f2d41b85a8

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