Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ca7a92cba0c692…

MALICIOUS

PDF

69.6 KB Created: 2021-09-28 06:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 46172bb3b97a7093c61b58da6e5b87d4 SHA-1: 61f98cc53713536a6d2bcda541e891f44a14a4c7 SHA-256: 85ca7a92cba0c692865ae86fe47af83ed266f798fa4c941722c964a3fca0fd14
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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
  • 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://pixomot.ru/uplcv?utm_term=lightroom+classic+mac+torrent PDF link annotation
    • http://sugarfree-gelato.com/upload/file/guwitifeken.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/87139021195.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/xekajip.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/zagizivigelerivir.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///87054945234.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/69394977964.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/jorejaje.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/jizizivigesegigape.pdfIn PDF document text
    • https://melz-feu.ru/upload/1658834536.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/96801958214.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/41ebc196a66f83b2ba8f6f52b1061aa6/45312735661.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gewirurigilime.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/4051b60b4a0529425ecee58feeb3dd43/dodujifamilipe.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109171553173630.pdfIn PDF document text
    • http://elektro-galerie-hamburg.de/userfiles/file/14912338534.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/89276819280.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/5229497483.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/86395980778.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/83779888773.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/xovoninixadeverogivew.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/kikutefedow.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161391dcf50f70---pixeperewigolabowuxub.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/68803643914.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/zivibitekogezu.pdfIn PDF document text
    • https://dhesient.com/media/zaxivukenojoporojaribejiv.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_off0000b224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB224 10636 bytes
SHA-256: df2bc06a3822ccd41ae29facd5bfd3e31d477f70b9552886056bf5890df2e817
font_01_sfnt_off0000ca50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE262 14516 bytes
SHA-256: 179228780631287f9230bc93b89b17c9818473cca2d34ed36bd6907cf8073a97