Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c172771691e5b4…

MALICIOUS

PDF

68.9 KB Created: 2021-09-28 00:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 048fd225ba8acd29a2444b7254455762 SHA-1: 49211b57b6f7c1522af1bbc254e7bfb9fe6fc878 SHA-256: 41c172771691e5b4aa75dd27ce3cc1c57a029ce21f5c852da2ca3636ef20e28e
156 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 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. The document's structure and numerous external links align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://impressivetravelvietnam.com/upload/files/tosibevurubijuxo.pdf In PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/bapanojijatesakiwivaxij.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/retaliwisiki.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210925214902.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/jedesaniroxulalekavenenax.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/xefewomupebised.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/55870186057.pdfIn PDF document text
    • https://fotografski-studio.kost.si/userfiles/file/81925339173.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/manidowo.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450db7ef810---57770214836.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/xeropixozipotokab.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/jubaze.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcbcebd6b3---jononodavililide.pdfIn PDF document text
    • https://mkontakt.com/dat/file/91665136647.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/77869682291.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/02c7c26a9bf6f16185c7bc1676a68be8/74351044549.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/85407810243.pdfIn PDF document text
    • https://fivetc.net/uploads/files/34416561034.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/33fb62524162489921538daf4c7d0b4d/26736220469.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/84345068180.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/xonavojafado.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/metorawesudelutuka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=kite+king+mod+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_off0000addf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADDF 15908 bytes
SHA-256: 1f671be739a515b8bd150ccc5f877c73680f5b70e90be030558a2c3d78af0cfe
font_01_sfnt_off0000d6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C9 10504 bytes
SHA-256: cf3a5e8ebe80b59ebef31e421594ac1e082ca9e6a669edea47a3fe2eef341817
font_02_sfnt_off0000ee6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1