Malicious PDF — malware analysis report

Static analysis result for SHA-256 73fe860df89b5fef…

MALICIOUS

PDF

82.5 KB Created: 2021-06-29 02:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 67501972dace1ef5eba6561327939c38 SHA-1: 80c98e399f50e1b137939ef0f300f6dac19ab204 SHA-256: 73fe860df89b5fef07bebf8d4640fb3704be3f91da8ceb6a7a28e3f6c06e822e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and the ML classifier also indicated maliciousness. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious or phishing content. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://queure.ru/uplcv?utm_term=the+extraordinary+education+of+nicholas+benedict+pdf PDF link annotation
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a70374322---veberixofiliwovonalen.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/8s56k9ek088kls1e59mhabvrk5/fatipujukatereje.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/tisosizali.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/mujogexenowik.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/kebivame.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/buh87rf91dptsu2o5bd4tocc0b/repaguxubejaxabovazofufig.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/18390412079.pdfIn PDF document text
    • https://actor-conseil.com/files/file/moxemalirixesor.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/wagexid.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608623cee7b87---10306747619.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf8bd7fc9---kopok.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f945bbd78---zedutazenuregibezogo.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/1510258987.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/5342984301.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/fimutofadakomulukotumite.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/d5c233cf9ec531d9feee7739840d4d35/wasajo.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/97199458158.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4d353dee6---18216950825.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/38762856320.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d4912738a---98238896463.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210613153415.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd67d5b5c4---12175884380.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/55627623605.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a370149e6f9---17614712755.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/22f3c77db5656b61419635c372d1246f/sezujikuromorej.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1620889539104029419.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/853080f73b8fb6163eccda08ad2fd9a2/35776782064.pdfIn PDF document text
    • 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_off0000db24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB24 17088 bytes
SHA-256: f148291b472d1de9a5fc1d5499ca514863cfabb35bcc47b16de698a425f6c3a6
font_01_sfnt_off000107ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CA 11136 bytes
SHA-256: 5076524088e2be4169100fd1602d3be3a30bc546660e0d9bc69ea4d3127e4b4e
font_02_sfnt_off00012190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12190 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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