Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccce8a6fda4dd8df…

MALICIOUS

PDF

70.5 KB Created: 2021-09-09 19:36:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2e90f7458e8628790634c5cd5caf1662 SHA-1: d23867c053c6d4325d0f11519331f95eff3f471b SHA-256: ccce8a6fda4dd8df89cae6b1a4b62338106baafc9ae7dd21301727d3a7d34495
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 https://andrejc.si/files/file/debetoget.pdf In PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/89592211942.pdfIn PDF document text
    • http://computerdoki.hu/user/file/48409160148.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/moduxokuv.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/turetanapasuwip.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210906193448.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133434141d63---6915641918.pdfIn PDF document text
    • https://shevian.com/images/file/rezogaxetizowojokediv.pdfIn PDF document text
    • http://www.bash.cl/media/file/tevudizujifedepet.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/70519591529.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/89372363404.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/jimujutifomuruduxo.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/3kbjgv1h9s5ta38ds2ieo78foo/nilakeraxitogewe.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/vivebekofolakekuwijik.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/wenabitinotodasopokul.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/58064142415.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/luziresexim.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8sb4n6fsro1rl2g0blgskfpkj3/bepijidivosiro.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/zizeben.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/14745994376.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210907_8367025E3A926160.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/wojovoguzidagese.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/3254763233.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/tixepabada.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132bed7e970e---buzuri.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/4637479545.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=home+design+word+life+mod+apkPDF 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_off0000b643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB643 10912 bytes
SHA-256: 48c92ee91229357b794dcbc8c9d59272b80fa30f52f30f3c8278544f0f3677dc
font_01_sfnt_off0000cf4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75D 14724 bytes
SHA-256: aa75f2e487322f99fa256ef1d8761e0e3eb55ed14a7b97b4ff8a66cab0ff6510