Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ccad8179185965…

MALICIOUS

PDF

84.0 KB Created: 2021-09-05 07:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1535e7dbc05d5ff235c16ab2dc2ac965 SHA-1: dbfadff7de5bbb64b9587892e8114987c29e577f SHA-256: 43ccad817918596585c345cac1ea5c06b21eb64200ed119f1a5acc8adbf0fd79
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose, which is likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3e4c5ea024---79977788324.pdf In PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/tolasikejunu.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/bf8f567bef928fd4c55ddc39298c6094/14428334496.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/bodadod.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/tidilumararatoz.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/zeluxama.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/fuc295ejimlm9otcm91s1mvrq2/sonalogelos.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/29649988686.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ff7615d37---6911542953.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/97048180776.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/fenasizomuxigijina.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a9f8d1e86---viferegotafapufebix.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fac75794b01---39655524462.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/51635835710.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/gigapowojakaxifud.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/josusagifu.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210614_A0C01D6A382A49D6.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/62296857335.pdfIn PDF document text
    • http://china-guolin.com/filespath/files/20210819210140.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/94ee4230fe3b4e8f3a2a18c484903d65/87525366085.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/5741647091.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f03cc3b3844---kopobofaralikiku.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0d74c83c0---wuworimaviwigeralovegipo.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/3dea29fcfd4a018dea25ebdbe85bdadf/jeginesovetopi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=cost+volume+profit+analysis+test+bank+pdfPDF 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_off0000e08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08F 17992 bytes
SHA-256: c844c9f4aae530abff60be6879130fa6c74f240df7776c8015e80fc4a6921ea3
font_01_sfnt_off00010fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB1 11200 bytes
SHA-256: b4fbaf90b41a5eb44f60080734691bbf06addf49d8cfa4d556da6636ed67a583
font_02_sfnt_off000129b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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