Malicious PDF — malware analysis report

Static analysis result for SHA-256 c498704ef911f431…

MALICIOUS

PDF

84.3 KB Created: 2021-07-08 20:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9943de8259a59a11779b0224a61306d4 SHA-1: e2950d2aea53dd6c6afcea0e47f03312957bcc27 SHA-256: c498704ef911f431a0b19ca1939499d2f45b94f40b00dbf92360fe9d88833f7c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The presence of multiple distinct hosts and the use of UTM parameters indicate an effort to obscure the true destination and potentially improve search engine ranking for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d32af76b55---gaxemexu.pdf In PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbeaf9adec---fagazedeji.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/72840916344.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/86832479112.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/83658678344.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072e66132115---78428951866.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/31999240070.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/pokixetesaxedid.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b758e48d9d6---57434138824.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c5b6810587cb01b73fbf80963a17a22d/lukisiledofasogujotalos.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202105310120146342.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6601d7cac---ramonakan.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/nifesope.pdfIn PDF document text
    • https://partnermind.cz/images/files/91520313916.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607238ec70ca4---likajukipiro.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/34d969cbc88ea3adb00dee3a2a82fccf/pukabakugamugajijufali.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/8512600086.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/47567791100.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/5c10b9d7215d2d0c054fdc31e0b18e42/46321774031.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2ab52b07a---35626702880.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/61115518030.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/smts9jegueevrdgfejkd0s29g8/jepetu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=quantitative+research+in+sociologyPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE775 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8C 10848 bytes
SHA-256: 9fa50b56e3dbacf8af2a7bd614736c06686dd0954c20b1a3caaf2e5f7c614fcc
font_02_sfnt_off000118b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B6 16648 bytes
SHA-256: 5281955470583649f4344ea4e45d7af936347a9c6c815f2340fc603479705fdb

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