Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9251afbc9a6931…

MALICIOUS

PDF

77.8 KB Created: 2021-09-13 13:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ebd81021558960c5c76243dc2604451b SHA-1: 8539b18b34438fc8e5a871a4183b72141e6ee523 SHA-256: 5d9251afbc9a6931cf437fea2925b070ee63ef4073ffc8f411b3f5d522e44672
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, with the PDF being identified as a phishing trojan. Although no scripts were directly extracted, the structure suggests it's designed to facilitate the download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5c4b6226d---45724678694.pdf In PDF document text
    • https://pr-dienst.ch/file/35098856872.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/26692720993.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/5afe5698a26236d133ccb5521df34bd1/48891086289.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/52582804857.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/6158be624bcefa3ad34a00bba6473db0/12744986543.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/95290231581.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/34513016771.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/ketejelulakusedowujut.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/jawifikusitelowofoxopul.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b537283fa---96341267005.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/67333456471.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/44359186633.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/latojinumemasarotidabaju.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/17039325490.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/riwirazujerami.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/foregetunalupesajivedaj.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/80718479366.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/sodexonudorikiles.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/relaw.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613437bb9be38---povakamonugilawutuvuri.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090513522068021.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/52141833636.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=jason+derulo+wiggle+song+downloadPDF 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_off0000c6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E0 19160 bytes
SHA-256: 053ea95e8556433db03f1e735e09e4f2e73b2f46008b05cf77b9ac09e7da9a53
font_01_sfnt_off0000f95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95F 10500 bytes
SHA-256: dd312424618df695314fe510e0ed186cce883dec0de6263914c0c5717be04ce3
font_02_sfnt_off00011136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11136 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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