Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d6fcaff3687a58f…

MALICIOUS

PDF

86.3 KB Created: 2021-07-06 20:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d060d2a4198ecb3508f5c01688ddb42c SHA-1: de65aae1e5be45f2452eb4c320b9f308ff828ae1 SHA-256: 1d6fcaff3687a58f5959b293c21b10de02743008f02da741a9a0262cf913a1e5
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://deltarents.com/upload/ckfinder/files/xinapujomujovu.pdf In PDF document text
    • http://stellamaris.cz/userfiles/dupavogotezetatawi.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/af8aa4477c916e67eb18391b5373b221/zipadoviseziwirevumok.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0628fdfc6c---visarigap.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/84555236111.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/xupum.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/88335743163.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/06f20b8b46e2de302b43c14d182993fb/56353294599.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/0p5l6ankjbpi1ue84jsafuskcf/21099156066.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/12930449875.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/40788159765.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a69d3d7f6c.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b07363680e---sabuzezaneporedajo.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/zelega.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/oegen9800gjj1skj8pb9kitlln/73359266913.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755780810b0---tebaburixowiwugufitusar.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/ddc058e5cd99b53a08245e1a03fa063d/13198804784.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/10984278823.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/megeru.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/luhn6v9fg9gktln5a45j9kaurv/fapopufuzuvavimufujav.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/67588599645.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/68885313432.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083045eeebd9---42196175740.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/67436809687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=parallel+editing+cross+cuttingPDF 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_off0000ed0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0B 10648 bytes
SHA-256: a4039cba61ec812cdad6d30873350d6a28fffb73ae80ac9fae76f712bd5c6dd8
font_01_sfnt_off00010552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10552 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D64 17400 bytes
SHA-256: 20ea16ed35e9941f3a4d4629bde79b73307c1536c4aac02d69d231eae1cbd701