Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb9f078005b06a64…

MALICIOUS

PDF

88.5 KB Created: 2021-07-22 05:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1bcd95ea0f564043d4b85309461d4a97 SHA-1: ec1f2cdb109e4acdf5009e2c53c816ecf8dfe9db SHA-256: bb9f078005b06a64c754d9846de27a30ca30d0978117a9fbd82ddc667641d16b
96 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites and disposable domains. The ML classifier strongly indicated maliciousness, and the link farm structure suggests an attempt to distribute malicious content or phish users. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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://amoy-art.com/Upload/file/kujugexakebofifowulup.pdf In PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b68f654fc---kitedejorawedoritigitus.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/bed9k1s585kgnndtr1upr2mc3s/69960875425.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeb6b42fc6---bibepiv.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/iqs4erfl28c9pelqgkbl5teerk/rebowut.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/e0e0fc8c2963e0ea967c0e521916ec2b/tederuxuribobutepatugu.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b891180a9---tuluzag.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0eb6ec33c4---bediripevatefer.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eda39efd40---wiraxukufo.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/xaxovaj.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/lipoge.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/89193971830.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3278527e91---51124143625.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/19928592179.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/7mspcsh6s0rstfaaotgvqs8rkq/mitatozevisebu.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3a29128c0---pefuxi.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/0bf7bd68f8a098ecf6ce62a5813aa78a/xukedadigik.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607542eaeb261---vebajumalejerafaxu.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/bewimiwodabom.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e47a61c03fe---biwirobavovaregem.pdfIn PDF document text
    • http://apsons.eu/files/file/bolomi.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/rajifufidudivojal.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/95088046223.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/0fbef10d64ab1f2bb043366c264467b0/69043165935.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/49fbc0b3067b6295095c2af29d105908/27943643073.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=damiano+bake+offPDF 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_off0000f377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF377 10196 bytes
SHA-256: eed1e77cf37e54f2e48967996bef768616350eef5869d0642a38c3a455333b13
font_01_sfnt_off00010a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A40 18804 bytes
SHA-256: 42c5bdba6ffdf493bb59a3eb52de2b056c41058440bdd33505977b6e2f48c6af
font_02_sfnt_off00013a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1