Malicious PDF — malware analysis report

Static analysis result for SHA-256 e25f79c6a08d828d…

MALICIOUS

PDF

75.6 KB Created: 2021-07-21 12:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9c3400c08b3da20d37ba9dc9a592cac1 SHA-1: ed5fbd75de55b941e3dec952a71a4ac8c41d26d7 SHA-256: e25f79c6a08d828ddfb38743965ff9e00dec1f7e076c8de9d03d478ef6637203
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 machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://anukulagrotech.com/ci/userfiles/files/36323987239.pdf In PDF document text
    • http://technoculture.cz/admin/upload/file/30177827382.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/f8281b1d8d606d6227415b4862548ad4/figezosezebiposudemizuwo.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/43509325786.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7b031c94f---48912181376.pdfIn PDF document text
    • https://33mobility.net/uploads/files/senopanog.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/86073964485.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/lamutofaxidarubamim.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/11f3a75f857b0d82c518583fb08c4f01/bimubamuwajuxareropixi.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160968bca13175---54869219527.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b41ee49dbc5---ladaf.pdfIn PDF document text
    • http://esistore.de/userfiles/file/11412290632.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/venanafexek.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/80484213760.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/2kpi00er5aa42paf8bsld6smfi/dazotudepedobofejekirafo.pdfIn PDF document text
    • https://medtek.vn/storage/file/3806774012.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/90005629686.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/fexakinuwebolud.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af86d0ce389---tasovube.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/76294216804.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160ad476cbb6ed---24653269506.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abb8b499b24---dipizabu.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/87237877869.pdfIn PDF document text
    • https://actorconseil.com/files/file/zexemaporoxoleni.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210623095613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=the+swiss+bakehousePDF 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_off0000c530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD47 10236 bytes
SHA-256: 5b41cf5b588f8cc204551c0deff9eaf04da955c9f862bb617f9658e03e7b672f
font_02_sfnt_off0000f47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47F 17220 bytes
SHA-256: fed40ec3273cd16c5716384c88edf7f8c54811bf09001464fc745475b21f1657

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