Malicious PDF — malware analysis report

Static analysis result for SHA-256 b649744f610e49aa…

MALICIOUS

PDF

83.0 KB Created: 2021-09-17 22:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bf166e5f66349142e47487f3c966b0ae SHA-1: 35c43a7fd5cbb0ac0e6336a4ac8e27aa89a02333 SHA-256: b649744f610e49aac471f673d53fe1fea6e2af47d974e15a783d5929f2387a63
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this document is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://oniceh.ru/uplcv?utm_term=assassin%27s+creed+games+mobile PDF link annotation
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/sonafuwisopudewenuf.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/soxuvu.pdfIn PDF document text
    • https://okazionche.com/files/nizonisuzo.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e6588641e---18828155138.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/47592128967.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210903182733.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc871be651---42384581823.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/61256301642.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/wefekukaluv.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/90793136303.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/tigadetevam.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/pirjr5ddfvls4l1bojthug2c9f/86931543322.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/78363503805.pdfIn PDF document text
    • https://0900107678.com/upload/file/dopafoxe.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/lodapogipunidigovenodog.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/55062183155.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/nofivigunid.pdfIn PDF document text
    • http://rurisnet.org/images/file/15484982354.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/lojutadosiko.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/runotevuwa.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132c4cddf68c---batosajorafukunokidurij.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/soxikadixugunapobefedex.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/93159999163.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/43671505371.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/9697243711.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/77141369163.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_off0000df96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF96 10768 bytes
SHA-256: b76c12f01c7c0853bbd0ac0d688b76c32fbb955e1bea704408f206781a57400a
font_01_sfnt_off0000f826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11038 17556 bytes
SHA-256: ed747f50d526ce12c0335f486280bc063e0b718a3206a2e51f1faf6e7a5a8c15