Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c48e1f6e75ee3e2…

MALICIOUS

PDF

79.0 KB Created: 2021-09-20 19:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a3a324114226882070ecccae31396895 SHA-1: 082536454e02497b395d46c019d1a8541a37e42a SHA-256: 8c48e1f6e75ee3e28840f94497ddb8640045827d60a62e48eda46e6ff37e9c84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to potentially malicious websites. The presence of compromised CMS upload links further supports this, as these are often used to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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
  • 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://pistant.ru/uplcv?utm_term=download+kimetsu+no+yaiba+manga+pdf PDF link annotation
    • https://fidelishospice.com/ckfinder/userfiles/files/6335115724.pdfIn PDF document text
    • http://z500.si/files/nupibufawana.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/99630242543.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613397079b018---31421601853.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16142864283995---jadeg.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/pefaras.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/mawinifawekakizu.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/49123284423.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/65147612656.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/30728362061.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/i46h9mdn5bttnunv7i694ct63b/misazixixizalug.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///galirezikivuselo.pdfIn PDF document text
    • https://heyratacademy.ir/file/31309414203.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/604ad2d906362ac693eea9b1b274437f/berupepitosumadidometugaw.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/89037073268.pdfIn PDF document text
    • https://riwg.in/userfiles/file/tidasitekewad.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/fuxagegasinezem.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/sadilafotubovilujire.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c05fe0383d---vezafeve.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/tolepomovawupatunag.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/fazenugamobefup.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/93461660283.pdfIn PDF document text
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/fekozapi.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/78271086587.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_off0000c94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15D 19552 bytes
SHA-256: 122d78909c5a5984d1b386646e7e2b1c0750bf4c629906be7194395310e22edc
font_02_sfnt_off000113d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D6 11272 bytes
SHA-256: 25797fc43f0bb9c2476d1dac642289cf21ee6a38abbb2f07f9bd508143ae09b6