Malicious PDF — malware analysis report

Static analysis result for SHA-256 75da56f001159548…

MALICIOUS

PDF

108.1 KB Created: 2021-07-31 22:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4831c4552f5211f430335a9a700b0074 SHA-1: 6809394a620cdabc21c4aef65b5c010c0df57547 SHA-256: 75da56f00115954803535f68bb2dad19d550db2531540da4e0f9aeb6fe5c46d8
172 Risk Score

Malware Insights

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

The sample contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites acting as link farms. The heuristic 'SE_INVOICE_LURE' indicates the document likely attempts to impersonate an invoice or payment request to trick the user into clicking the malicious links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9870

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://wastran.ru/uplcv?utm_term=metodo+ueps+y+peps+ejemplos+resueltos+pdf PDF link annotation
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/8dsmue8tdprcebgs5groc16ba4/58872197942.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/dee5e6fe1o88c7dfnfbmi079g2/nifixujatadawopox.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/gozorenefubaxonini.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/99c367ed47f260e05d223f382aa04ee6/dopogewemudave.pdfIn PDF document text
    • http://asfalon.com/__files/file/lubimafofamuzepibe.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202106250550538083.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/8c54722fb33ab6991b6dcd66b24deadf/33831136992.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///44086527747.pdfIn PDF document text
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/rasisigamegu.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160edef72ab1ce---34055756680.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/251029244223.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/95690736511.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/sefaw.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9e874db4f---81810117502.pdfIn PDF document text
    • http://whatdwellswithin.com/file/82519606405.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/xufobawisazokoxami.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/f9d5vhjt7h844gegcg1javrena/weburagigogawotamonoz.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/461078d60f4c1460de9107daedeb3250/9999271838.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16090db0931863---giwigajeremagekagat.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160fc2e5fb3072---91076173688.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/3db3702d98bce8719c01a95040db5b1b/95711019261.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083cfd644197---38305728494.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/lagameman.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/08c940c74dd0f249094d1a6236275d97/bagebusamasetalekux.pdfIn PDF document text
    • http://tfforming.ru/d/files/7457006516.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/rajikevowijetubimat.pdfIn PDF document text
    • 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_off00013aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000152ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152BA 21052 bytes
SHA-256: b559ee0a07dc0d613783500534aaa0a0c65d3b09cd43e73b6c0297ffe5224dfd
font_02_sfnt_off000188c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188C6 10640 bytes
SHA-256: 61a5643489f74aa4a20c790af827c1c8271583231304543d71cf394ebd06de95

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