Malicious PDF — malware analysis report

Static analysis result for SHA-256 5620c2c8e467dd11…

MALICIOUS

PDF

90.2 KB Created: 2021-08-02 15:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f2f5e9504a382fb6f8b02ab98fa8f8a7 SHA-1: cfb7c172ad4d725656400a399d1a44a6bc5d49d0 SHA-256: 5620c2c8e467dd11eb55d6607336e7c6ff2f97920a4910ae0d84226403d9e793
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The embedded URLs point to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF's structure and link farm behavior are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/5151bd0513f706817f3a7a5e7675c592/ropaniguligif.pdf In PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/24095588250.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cefd903e0a---mapofelimuwa.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/roduboxeraxazo.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/21297480753.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608428313cbac---74104610768.pdfIn PDF document text
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/18039093365.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866d0ef2786---dukobuja.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160891483ed7f2---30628016186.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/mizoberepimusaxagomazasi.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/63299345102.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/gegat.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/gaterofanasalipage.pdfIn PDF document text
    • http://sukhabalka.com/files/file/55089378844.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/wusutumodawuginu.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/pevopubaxenepise.pdfIn PDF document text
    • http://www.77ice.com/upload/files/wawujakuve.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/vusugusegijesefe.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092dca4d17ac---mirajexazikiwurawoloj.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/29024330646.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/57566256142.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/gunusepadujisex.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073a9ff39bf5---lewuruninazeropawu.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/7cku2b92hhe0sa3a6vdnmte5a6/gamobavuvusututepurufik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=como+baixar+gta+san+andreas+para+pc+fraco+pelo+mediaf%C4%B1rePDF 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_off0000f374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF374 20072 bytes
SHA-256: e0541ac0fbac6ccdec967fa78f35cf30b62d110039e41935852b48dfdf5f75a7
font_01_sfnt_off00012494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12494 11280 bytes
SHA-256: 818ac5256942e8b05a3eeed3bc1aa5bf5c70a527123389154183a58e9383e99a
font_02_sfnt_off00013ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1