Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c7f1328da3c6d19…

MALICIOUS

PDF

74.0 KB Created: 2021-09-01 08:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8444487ec65ca3803558e69cf19ea12f SHA-1: df9ba375553d5178c7ebe7394a18f9485ccaa87f SHA-256: 6c7f1328da3c6d192df7e8028616a8bb9431c754f9a41e86e1e9b276179866f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0e934661---34389849465.pdf In PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/towuzogik.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/61242026671.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/pidava.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16092c05636af8---zizafesazunojenol.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/banekikab.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/73926873106.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161006a24604e0---57508672054.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608784d0c6441---divese.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/lapajebozokitegefugerutid.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/27840743173.pdfIn PDF document text
    • http://masonfamilyreunion.org/clients/b/bd/bdaf0a3c19eb5f10f0519c747c117e37/File/wepiselajotewugiveteruwak.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/zepomobagudepetikapifume.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/c75297cf8ecca64236d6a5b38071bcce/93022104913.pdfIn PDF document text
    • https://rajatotogroup4.com/contents//files/13155960712.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/c6702b334738767f4f78a29cc32a5df6/juremak.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b47c9b4f964---61980426597.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/t46g9rf6b2eth01klmkooahfd0/50206371250.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/nemasurut.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/6441d462848945745a4ce83f10f13980/figurorexiga.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/kuwotevipexofijemuko.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/zigofemorilijedesi.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/24556682462.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/gp8uushru9ir8p7h9lknorc5v1/65076634808.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/lelaroligixabinuwevewiwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=phone+number+845+area+codePDF link annotation
    • 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_off0000c136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC136 15620 bytes
SHA-256: fa7b49f2d038cdeff8dfded89c7aca1f5955e39ca8e526f87263e649ac9e4b12
font_01_sfnt_off0000e95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10175 10892 bytes
SHA-256: 591d08633e840dd41ee8dedcd615ab325311b7e8bfe99e1ca30e5254f26c6bd7