Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ad8569f25db0a16…

MALICIOUS

PDF

89.8 KB Created: 2021-06-27 16:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5174a89ef9a8b896fd0054a8dd17b8ba SHA-1: 4deeb3e68dbd5e6e55c1fba7c321773ee1f1b537 SHA-256: 9ad8569f25db0a16b2e6a4dd506ef06a36e64b29aa91ef6f42d0392a37de4f6d
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous links, including those on WordPress upload storage, suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nfc.soo.jp/file/64312487335.pdf In PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/abe85c6d1fefb2c25f9d456515e506bd/92290482971.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607dec1c247cd---73803273571.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/penupalibunemujuwawi.pdfIn PDF document text
    • https://socohoteldanang.com/uploads/image/files/72187241189.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/fc47302544894dcf301f7ccfc238f524/92905621039.pdfIn PDF document text
    • http://burchiellati.com./file_fck/file/99097743622.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/9eb10ad626106d29d34ec9e07265f3e5/laderovifexatazitoseto.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/67155093610.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/simuvanunaxetuzukoborore.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/262k8l6e4jmlekoktckgnvfe15/90761376231.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/lkc0f6brli8fln0308s8rpv6h6/wivodakovozajakejenuwux.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16093cb778117f---86827378998.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b3bcd941a---taxezubesimoz.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aab3ac33415---zewigogos.pdfIn PDF document text
    • https://longhoang.vn/upload/files/buwejo.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/75ab44039565f6406ade5657ff271acf/12975512157.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/gedifemofubenosi.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/a1224c561df35e88022971e6869900b3/87630118066.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/bobawikuvoderatexinafodu.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/fea2aad4bd7ef93aeaf4ec75040c06fc/63081393825.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b67d254c34---kikadakakilomurisazi.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/78577335666.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/trtbu4j9dnufds8qb3022hno0r/ponokodudejarepasubaliso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=national+plan+your+vacation+dayPDF 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_off0000f946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF946 17764 bytes
SHA-256: b9447b3c28c51ebc4ddb2acf18b612b86863a38c27f5bc297c6f89a2a9930bf2
font_01_sfnt_off000127f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14010 10464 bytes
SHA-256: fec1f9bb214c37975003803791dba5a6f81029d0e1b4c1535215409382e9f726

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