Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6de6dc9e27e5a91…

MALICIOUS

PDF

85.8 KB Created: 2021-08-19 21:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1a377d0328fddc11132d877b8cf9f460 SHA-1: 14a2ae1b81fa5b945c3a35bf4a724495c349ce87 SHA-256: a6de6dc9e27e5a91459c9228d152ddafe841bbe773eff070a8ed5170267e20b2
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable binary data, offering no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/78upo7rp6rrvt0h0r1ifodlnn4/kiveniruzugawuketozimo.pdf In PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/buwetigemizarum.pdfIn PDF document text
    • http://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/11878426954.pdfIn PDF document text
    • https://soechi.com/userfiles/file/migij.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/73104275589.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/pedalapevibik.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mukemosibajomokigutafipal.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/43447548671.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/17490931586.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/39356150682.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/vuxupilirilifemu.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/vukuzazisuzifukoromekuto.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/59511551022.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/fc893dd4b181f47131be8c1358a2c624/fimupipugojikesarujup.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/devevijofekafovenirudu.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/7e04c904e1f9f24527065bfa2e0c74b4/najisoxozinagikadi.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160836f9c00978---22216397671.pdfIn PDF document text
    • http://groupkaishan.com/d/files/63201528708.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160c483ed6a0c3---16129345159.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/35368679550.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/56417585043.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/gkm3i4cagdcpvr6pnpktc51dpt/91401839411.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/rugazorujefoduwizupor.pdfIn PDF document text
    • http://nakatka.com/files/file/lomejevemepipajumenubis.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161166716c1b4b---16369680266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=can+you+day+trade+options+on+td+ameritradePDF 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_off0000eb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB98 17032 bytes
SHA-256: 00ecb9a64271b6c85472c8e2e3ce8e33d620fd1af3b42d2b58b00eac7ee6ec9f
font_01_sfnt_off000117b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B0 10752 bytes
SHA-256: bdf205d1265a1bf7771db01f65ae1b4ff1dec3422a4efde80b8c3a903cbd4d49
font_02_sfnt_off00013074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13074 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1