Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b7a15389e4b568f…

MALICIOUS

PDF

92.6 KB Created: 2021-07-13 00:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e7ae4622c73f4665303488373c4a30ad SHA-1: 99952474527d0301f06721393cb79779b0b51a7c SHA-256: 8b7a15389e4b568fdb5b17ee982f06eb5be22f2143d2b4b7b4d8ae756dbe7618
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b5083d0c4---tinemibiwip.pdf In PDF document text
    • http://chieucoingason.vn/files/nanibefusil.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db2dfe1ab0---rarawogojozofobilapo.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/68355291353.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070076264544---fotefugepejepinapab.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/powenedevimoxubotodumuwe.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/35775460291.pdfIn PDF document text
    • http://adveotec.com/img/file/meruda.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/pulenomenijokujuzeluwudim.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/15824094873.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/kajagujebijin.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b50cd98d4a1---melosefejefigufezovagoroz.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608444613b57a---fapetaz.pdfIn PDF document text
    • http://contelex.it/userfiles/files/gokibopuludegabo.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9b9260d63---43194210348.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/76862274267.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/zizidipejuzubufojajisu.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a817e62e8e---19062768568.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5763be6ee0---17615202451.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085836b7c945---30454684899.pdfIn PDF document text
    • http://produccionesproezas.com/clients/2/28/28ea8f13eb032e89cab2838ec144e7af/File/vomejiki.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/42552fn455qqroolf2tp2nlhb2/19213138244.pdfIn PDF document text
    • https://bachson.net/upload/file/45006188536.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/lelixaxafakadater.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/e51bbd2495d8258d7e2845c916bb8760/wejujoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=meaning+of+the+song+buffalo+soldierPDF 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_off00010a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3A 10868 bytes
SHA-256: 3c2e05607d67ebcd02bd645f8b34db12cd4580b7d4f758662f8b35fd675bb47a
font_01_sfnt_off00012307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12307 16272 bytes
SHA-256: 2c8b293a3376fd2d08167c3d7a2ffb44b3bee858605e2dcae0e75e3d1a9072d6
font_02_sfnt_off00014d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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