Malicious PDF — malware analysis report

Static analysis result for SHA-256 2755039abc0260e9…

MALICIOUS

PDF

79.2 KB Created: 2021-09-13 09:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bab63629fbc578bd2f4bfc979180c42f SHA-1: ccc44984c183d4aebc6a450de5167470540a596e SHA-256: 2755039abc0260e94e934db1e222adb06f88fb827fa2f678d10d2f9d8c002319
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL analysis point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://sichera.eu/userfiles/files/binajuxipavifigeraz.pdf In PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/neziniwoxowebuv.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/rorexipinarodovebibewa.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/dokekaxabidumixoj.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/06d15idhjebphl3nhnp52uj4hi/11766374179.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/goterisivaped.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/jipujit.pdfIn PDF document text
    • http://chinalabware.net/d/files/gujojavurakitunevefava.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/28679455222.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613920c6ec3e9---garabuwilulokofof.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/vaxaka.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/genixitexizukabi.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/vrkfjo233a7uko5obffs31cbb4/limokikapaxepoxemefe.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/ninotumidi.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/vevasope.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/21216445230.pdfIn PDF document text
    • http://koutingchina.com/upload/files/nofobevakemokilapotixasa.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210906151823.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/lunifapidokuzekiwunene.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/kekotekulubuxoponabixabul.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/zuzotuxirupiwokinavoj.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613527cb611aa---69975257023.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=galaxy+wallpaper+4k+phonePDF 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_off0000ceb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C3 18772 bytes
SHA-256: 71f49b00aefd2e1aa16297fafe7c8476da67d03b10dd219f3f6cbfb7d9e6b70b
font_02_sfnt_off00011791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11791 10504 bytes
SHA-256: 9451a375e5be9d951cfa7af6df653ab051092eda54c49e17abdf6f25971bbf84