Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad223fc689a2ec32…

MALICIOUS

PDF

87.4 KB Created: 2021-09-21 14:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d6c61036fd785a1b051967136a21e7cf SHA-1: 4fa821f315ce8d11102fff35ca2823d53bac5dd4 SHA-256: ad223fc689a2ec3217636d58fbbb5168b02ee6f28e6e6fb0748528d29e1d575a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://eirai.org/editor/ckfinder/userfiles/files/71017638293.pdf In PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/c77cad160e68b18f2c171dac3356889a/68978556592.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/44355665035.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/14079809291.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/rodorimuduzoluvulujit.pdfIn PDF document text
    • https://thietbigas.net/media/files/nulusisofiwav.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/191816485.pdfIn PDF document text
    • http://yanartextil.com/firma/files/zudidujerabeli.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613394659b0be---29962773258.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/55659355439.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/48601718075.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614916e388dcb---29967882788.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135708f78abd---53300485871.pdfIn PDF document text
    • http://www.first-classlogistics.com/image/upload/File/jowewasakovaba.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/50944012449.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/52425550995.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/vifilale.pdfIn PDF document text
    • https://theurbanthinktank.com/files/pokorenedusamexolewijoned.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416e07076af---20589577481.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e1be20901---dobomobijobinokalosafovon.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/79591546413.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/12829128938.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/93449543427.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/jutebosavutefomem.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/56102981397.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=123+go+movie+streamPDF 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_off0000f18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18C 17792 bytes
SHA-256: 2d6861fbc69cf2fccb5577537e102f4425e5003a859ec80dd386459a186dceae
font_01_sfnt_off00011fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCA 10612 bytes
SHA-256: c60874e9702ad71d482dfc553aa08ccc70997663a949674560a362d0a26454cf
font_02_sfnt_off00013833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13833 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1