Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb503df8f0a9d75…

MALICIOUS

PDF

77.5 KB Created: 2021-09-16 22:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aa749300f474eaf737325474166825c9 SHA-1: 50f566abdb8c7563b9402ab52a6db891b45f02bd SHA-256: 1cb503df8f0a9d7559b50b911b7b509d08710c292c01e4eabfab63ca85bf0026
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://meganimal.pt/site/upload/file/84328039640.pdf In PDF document text
    • http://uelzecht.lu/userfiles/files/74754321791.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/megurugiju.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca9a85a4ed---bukoderegomipiwiwiwarodew.pdfIn PDF document text
    • http://kunbot.com/upload/files/4129590565.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/74526980639.pdfIn PDF document text
    • http://gapp.fr/medias/files/motozijimowakimutabopuka.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614187b04ca46---vujamevevafer.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/79803106812.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/5840091060.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/tuginixetoro.pdfIn PDF document text
    • https://bem-sa.com/img/file/niturelufaf.pdfIn PDF document text
    • https://pactforfamilies.org/ckfinder/userfiles/files/gewav.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/35303144270.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/mijugitodisim.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/nipusibevosukotog.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/71377818410.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/sofojitinunujazoxegibokub.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6567b98b6---95558379181.pdfIn PDF document text
    • https://akvaguru.hu/user/file/muromujaxozugevumatovijej.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/53464110224.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331fd686356---kewajerogatup.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210907024703765133.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3d6e633c8---tuwipatofojel.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366ff404019---xexakog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=excel+sunburst+chartPDF 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_off0000cc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4C 10440 bytes
SHA-256: 07901a78ff4549998a9d969aa4b620b226cd0632bc84fbea1b9fbf9dfe9997f5
font_01_sfnt_off0000e3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FA 17200 bytes
SHA-256: b41f742014d56803ebbd4b01f52302ffd5011ddf10007e61290b5168de9a480d
font_02_sfnt_off00011056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11056 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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