Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c4ec442361b727…

MALICIOUS

PDF

92.3 KB Created: 2021-06-30 14:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2215021bf2bb891a9ca4f9d65d476e37 SHA-1: 065252da0c3e371e2db57c1e6fe0e48d8c5616c7 SHA-256: b7c4ec442361b72732e7ae9acfda62b8a2aef7d637fb9d940937866fbafac924
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ClamAV signature and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely intended to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, further suggesting malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072434848252---fexuxufudasevafavoponabet.pdf In PDF document text
    • http://fd-health.com/upload/ckeditor/files/35406913459.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/62678931924.pdfIn PDF document text
    • http://immopolignano.lu/images/83078238609.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/3873331e8fb16ca7b971798e5de8df45/minofawomeridesufe.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/2ftih819b04vjbchm3m6sgael4/35122528301.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/36223366793.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/551b31548dab9a96d879314bd0437b26/80890293227.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/1002720813.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/9208542e5ea74c645ebb6e239e33160c/58414244806.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e5cc91bf2---wuveketibakob.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/lbfqfb92d3a37ccq3kmhjl44p6/vopuloworigizolepojo.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/5de4c426f663329a8c55958e2ca5606a/50790602546.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607afec54ecbd---61148156860.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/73b90ed20eabf0ec54b3a742e99d92d6/lawegawa.pdfIn PDF document text
    • http://ehhs1969.com/clients/6/67/67a0fa02f482ea8575b7cec7429e43a8/File/58262184276.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/5f379183204ebdf21f47b46874637389/somiwonikaj.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/d690c4548360c348cefcb2693cf7042f/84455845815.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/39628387849.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/2hsn7tbsc2iihd005gbbm8k1p2/jolikomoduborova.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/76760935943.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/cfa0112c68f76d25743102d3315ccc25/mobokafonawe.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/76559578426.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/difarabopotosire.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608769448d7e0---51094188684.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873bb1d3902---luxeke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=cookie+clicker+hilePDF 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_off0000ea8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8A 18556 bytes
SHA-256: 2e3284efa86fac86524d3e01002f29b1b7a452645d52d6f82bff0f0410c7195b
font_01_sfnt_off00011928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11928 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13139 18200 bytes
SHA-256: 58120fc07a10101adae21e52d0e62bcae588d162cf737b0c2bb8d3601388782e
font_03_sfnt_off00014da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DA7 9916 bytes
SHA-256: 6fb85c06f61feaebda4bc13b5d8733a420d8c9e2c1534b2643e1341e550c9320

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