Malicious PDF — malware analysis report

Static analysis result for SHA-256 842305a1ee23311a…

MALICIOUS

PDF

81.1 KB Created: 2021-09-22 22:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c51d9a69ffd6b93c4407855a23e5635f SHA-1: e0cc8d7addb3e1500632955d65a1a06bb2bcb501 SHA-256: 842305a1ee23311af2e324a8c0d4dd57a25598e80da10920f9ab1f3682cf6932
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://archism.ru/uplcv?utm_term=connect+android+phone+to+pc+internet+via+usb PDF link annotation
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/80681866610.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d9df4e190.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/1955449544.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/731e5239805a1fd6a17a4cd419989da3/58471496101.pdfIn PDF document text
    • https://nasikampung.info/contents/files/fenutivixegix.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/gexera.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/72526715269.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613286ec045da---38929447036.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/tatuvaji.pdfIn PDF document text
    • https://sanidom.pl/img/file/34004908069.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/tukamolevetamexuzap.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/38417537192.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/80749181575.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/22102155684.pdfIn PDF document text
    • http://autovoda.ru/upload/files/tomasovavitupod.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/95146227931.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613697c4b1cf6---82000987044.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614aed568e3fb---mujutilugatigavinowo.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/94174279652.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/15844042170.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422d918dfdd---78839940204.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/40154651503.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/daxonetufofefakaren.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/22243168462.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_off0000d769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD769 17872 bytes
SHA-256: 17da0033baccf6cadbe3629ac3f2730db5a0fb183b04d67b58a365a3be5d9ec9
font_01_sfnt_off00010581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10581 10904 bytes
SHA-256: 7ddcd5af414a827e5d0a9bbdd9d1ef7266a8a5ba8c186ab4d251a4fb2bc62966
font_02_sfnt_off00011e85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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