Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ca70417cb7f485…

MALICIOUS

PDF

84.1 KB Created: 2021-09-18 22:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 69699be9a1f7c8dab559e07e95244629 SHA-1: 4d31ab3fd1226a02a03f5c861c9c0bdf17f851b3 SHA-256: c7ca70417cb7f4850c9719ede3bd360735f46de12a17e871ef35db9af4bb54cc
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by both ML classification and ClamAV, with the latter specifically flagging it as Pdf.Phishing.Trojan. Heuristic analysis indicates it functions as a link farm, containing numerous external URIs pointing to various websites. Notably, some of these links are hosted on compromised CMS upload storage, increasing the risk of users being directed to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://yuktogel.com/contents/files/75190721987.pdf In PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/jenetajubeza.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbeb1108b2---68924467398.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/68992659660.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/84977596306.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/31144028377.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/kuruzugujoduxibuko.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/95447697572.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/94232268052.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091104002773499.pdfIn PDF document text
    • http://kezheng.net/Upload/file/defokavarawixinigijikere.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408f3fd96e5.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/91791632257.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/wedifigisopok.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109091612063199.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/mivometilibakupejaw.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/10061006998ac9f0444521c6261428fd/kapidatotesireke.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/tazuta.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/sufodiminiwusobuvug.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/99721880984.pdfIn PDF document text
    • http://poliinc.com/upload/files/8850238883.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/68343533569.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=intelligent+cv+pro+apkPDF 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_off0000e3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C4 18360 bytes
SHA-256: 74d87059b80c32eca55ef87e39add8a3311d2876ccf5635002b7652b38b66194
font_01_sfnt_off000112e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B00 10492 bytes
SHA-256: 1c29b15f1014c0278ff4d5402b25f18c3e390ca61a3f56b560735dbd682b6baf