Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ff412c85c0d88c…

MALICIOUS

PDF

75.2 KB Created: 2021-09-06 09:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cc89b8dacd17f880030a31035ab535c9 SHA-1: b9b79865c857bfb5d3b2c30158167cc33104084b SHA-256: c8ff412c85c0d88c5f03a5da2a690aa58f1b6b3ca68e14d2d89c6b27cd58d0c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to obscure the ultimate destination and evade detection. The embedded URLs and link farm structure suggest an attempt to lure users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16073eca9a8e36---nojiv.pdf In PDF document text
    • http://solee.cn/ckfinder/userfiles/files/33717633913.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/84711471751.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16097e778746db---3062691910.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/bolajipenufakibelufe.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/872198215.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d90ecc7db2f---fegiratuxa.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/62295828552.pdfIn PDF document text
    • https://33mobility.net/uploads/files/61914697565.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/27537634261.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/12970695551.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/61710009756.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/j4m2ishv58a99v3mdns5ai8nr1/kinub.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/14625673851.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/6d7jplkfd18mehjf8dqpu25o45/nakofekufita.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160afe47a0a6a0---35343709731.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/befekikepejuxufoselom.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cb6f99542---mokamemifowiwutodegebum.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/86056342830.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/womutofubegazij.pdfIn PDF document text
    • https://netpage.info/userfiles/file/jujerasudevi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=persuasive+language+worksheet+ks2PDF 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_off0000c214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC214 17224 bytes
SHA-256: a18fa8a7577ffe9f0c0b5eb9d95612916da67b1a142ce819aa1f8a172f5cd9fa
font_01_sfnt_off0000ee9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9A 10852 bytes
SHA-256: b172294e26cdc9b7081818d81f0810a87eb62737ea407897f8583eac2ffb07a4
font_02_sfnt_off000107c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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