Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9af1be1915f9d1…

MALICIOUS

PDF

71.9 KB Created: 2021-09-05 03:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2fac756094ca7717a4d894143fedbf1a SHA-1: 859412f4f51b98b4d291d75301e796b888288722 SHA-256: 8d9af1be1915f9d1b692122c8faa1004dd6873e1420e14cc820f8c2af6cc348a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics strongly indicate malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://dienlanhhonganh.com/images/pic/file/21980836852.pdf In PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/320604235e299ab4bd60d02b9d3314af/28761027214.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/e0f5ae1061e64582528065448f2888df/pubogibusiraralop.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/tiwukawo.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/86246208240.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/ruxabedinotisijaweged.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161216ed1aff5a---29563571281.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/66355637603.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/57628353899.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a3d911a11---kafagofovuvagedoxevo.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609238ffa3bc7---memodekojaxolav.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e83bb1913---79267945318.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/81458583216.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/54578753356.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/24478843208.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/76449744724.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd12496b3b---muzaletubefesepesakono.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160bfac87a264d---vakuka.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/sexetofi.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210726_F4C15F8F100C5629.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/paxogiluwi.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/galugijidusaxoni.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/ribudotuvatirasa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=mechanism+of+antimicrobial+resistance+pdfPDF 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_off0000b525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB525 11016 bytes
SHA-256: 1eca60349088b25ca4badb361f966b0b9780bdf7f6ae64ebe72544713993368a
font_01_sfnt_off0000ce4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE661 16856 bytes
SHA-256: 38522d2fd5618588789049a1948b8e8098383ef923ef0372d506b27a1076cf95

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