Malicious PDF — malware analysis report

Static analysis result for SHA-256 52403ad179c43e8d…

MALICIOUS

PDF

92.1 KB Created: 2021-09-03 20:35:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 34353c42dba62f00df1dd68495111707 SHA-1: 81c4b846b86d930e45a87165872c74db997e31f2 SHA-256: 52403ad179c43e8ddd44c26d0103f241de6b29e11cff6909eb66c6bd888fb32d
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to host malicious files. The presence of a 'download button' heuristic further supports the lure of downloading a payload. ClamAV detection and ML classification confirm the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c42fdcd1d3a---rigimazanagomaworukif.pdf In PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/04904db3f3c8469bb1f487bbe3756223/25413975477.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/65122807614.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/woxobofajawebusemavuxol.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/kn438jtmhechuuf8db9580r2p0/72622716442.pdfIn PDF document text
    • http://orderkai.com/uploads/files/37709752525.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/41204456015.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/bineverob.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608189d40832a---kewawimigonupunosud.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/76fbd92bb3aaf2c62a6900f0cc3be827/putixaduzozatokafenaxax.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cfa342f612---45013031098.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/barupibifijaposanajipawe.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7171b40f3---81581972560.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/vinebozas.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/27301069873.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607727266f446---54021788804.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/sisefawodolazatagola.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/9a1a24e0e5c04ba983f3ed1e6b95825a/95892747096.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b183c4f2097---feguwogobusetuxup.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160876fce8f026---zigatiroladewawivi.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/11065362861.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/wazosakugalilenalawatuz.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/9313756946.pdfIn PDF document text
    • http://szwygs.com/upload/vodiluturixudaz.pdfIn PDF document text
    • http://atek-ent.com/upload/file/fugun.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/sisoladejekew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=e+governance+upsc+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC91 20580 bytes
SHA-256: bfdcb242cf3d5ec6c23704ff298b3e9fd34fee4a37210a4fa9d386ae45d5dd49
font_01_sfnt_off000131e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000149f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149F9 10708 bytes
SHA-256: ba559d2b3206dea7f8a4ea44ec54d6d527b22abc7db77f389959b5c7c4547d22