Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fc55b2b8c8cc1e6…

MALICIOUS

PDF

87.3 KB Created: 2021-08-17 05:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 61aa60e5d7ff9f9da9e34c29e3eb5399 SHA-1: 7fdee97812fd18fad84f0877fca83be4bf912d3e SHA-256: 2fc55b2b8c8cc1e6fb24471aac796e72af8aacb53b7fe0bf56e815ec50d9ade2
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories and disposable hosting. The document body is unreadable, but the presence of numerous external links suggests a phishing or SEO poisoning attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa4bda155c---59227871142.pdf In PDF document text
    • http://frangarcia.eu/upload/file/xutubujoxefakedak.pdfIn PDF document text
    • http://lexizfq.preview.infomaniak.website/wp-content/plugins/formcraft/file-upload/server/content/files/160d3085c16cb0---gixenomepina.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/b3884d2a140de2709d94d293c9cfadca/80527014585.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/sawarekozuwuzitet.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6ff63fcf1---33336660308.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/kuxeri.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f851ccc79b7---sidopepujetoxexodomag.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/mosoxij.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/ca129a1a0e46ae04be6a62156eccd448/65824102905.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/78882249296.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/69581514585.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606f28961fff7---palipevuwelozorizinu.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/wedijaronu.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/xufowize.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe9c679bb15---robewetojazawes.pdfIn PDF document text
    • http://zzweien.com/d/files/84129588954.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/29045910533.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/91606293801.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/66fc7gb260f3qltv7dgp5fc341/7166964237.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608616054a854---77339545281.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097286178cdd---20302859423.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=harry+potter+all+movies+sinhala+subtitles+downloadPDF 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_off0000ec5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5F 18404 bytes
SHA-256: 8184d056c7f6c6ee498bd990e0a5939202b4d4172d8dc59a1d31f32adcc6abd6
font_01_sfnt_off00011cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D4 11152 bytes
SHA-256: 3ace8987e5097ca24c5b5d3eae2e3aad9a1bf86e3f14870919eba075aeb1da3d

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