Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd8ff583a80a86b…

MALICIOUS

PDF

78.7 KB Created: 2021-09-12 00:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 38fa1c156c197155ff62061a99e733e9 SHA-1: 1f29540a55edce7f3e7dc309565de018a907769f SHA-256: cbd8ff583a80a86b27c9f48544ea03c3e3929d2598e1044b61a2df4a2196cf21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 http://viajaconsciente.com/imagenes/userfiles/file/23971938792.pdf In PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/6c99cd6c4a728ffca8819497e27668b1/jagesepivapotuxudi.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/toximo.pdfIn PDF document text
    • http://acelybio.com/upload/files/piritazesigetafoxuwim.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/xuvuxifogonudefat.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/41123383878.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/499379177.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/rorinamoxab.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307aa374076---15854053133.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b037d1d3bd---45463555194.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/defasan.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/nutojitikoluketepapuva.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/9116531940.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/86997937b0ef08558c8dc8639632f566/78576246903.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/nawidoxibaxew.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/78999437922.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/42923007187.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d232575e10---wirubonad.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/49448346188.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b02d791e62---90746888561.pdfIn PDF document text
    • http://centronegozi.com/public/zozobutepunamevupovut.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/50666298718.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/99037934558.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=paisa+kamane+wala+best+gamePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46C 19296 bytes
SHA-256: 454673d53b2eb2c22547515d6a47be1905500755f54cd9af72eddc431b45f91e
font_01_sfnt_off0000e55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD72 10548 bytes
SHA-256: 60973ba66bceaa33ebfe407aa5747f529ebeeffce67005f4477594fbffcf5de1
font_03_sfnt_off00011586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11586 16232 bytes
SHA-256: e06ebeaa2bb94d9bf14337b0794fec2c9c4a66e30291689b6f6234bfe360c8a5

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