Malicious PDF — malware analysis report

Static analysis result for SHA-256 34089dc821e27948…

MALICIOUS

PDF

86.4 KB Created: 2021-09-20 02:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a84997b8d50737f9ce9fb2ae7c8f3291 SHA-1: b93ea5eb66501080a4340c3a57cfe713a4c9d4b3 SHA-256: 34089dc821e279488b7e598e90a9d975e2c41f5f57eca8f1e8e3b2702ba9cf76
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple heuristics indicate malicious intent, including a high ML score and ClamAV detection as a phishing trojan. The document body is heavily obfuscated, but the presence of a 'download button' lure and numerous external links, some pointing to compromised WordPress uploads, suggests a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the execution of a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://domesticsolutionsagency.com/userfiles/file/11849740724.pdf In PDF document text
    • http://coiffurenais.com/userfiles/file/getabuvasixara.pdfIn PDF document text
    • http://it-hair.com/userfiles/jizoro.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/16246963966.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161349dcaa3b10---15331224770.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/wilib.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/86355749481.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/zinusironigiwebimux.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141752674024---dafifulasu.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/17797611815.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/8ef059bd5b20708852b9cd5bb373d08b/61721763835.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/kofowelovotila.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/d6f76bd8a8b62071752247bad812b172/70862312415.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/sexijemetuxedakaxosatula.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/rukekobusisirokef.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/zuzupedatarorugu.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/93968322237.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/18917573436.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/nexizuserupokuto.pdfIn PDF document text
    • http://zae.me/datafiles/file/12921603572.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412c6eb8f16---zigebezatavafakudav.pdfIn PDF document text
    • http://dienhoabacninh.vn/webroot/img/files/zaganatiwozuvevir.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/24081767444.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/derazufewapoda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=fifa+2020+apk+modPDF 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_off0000e8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AF 20092 bytes
SHA-256: 5dd26884d2423b7cdbea475dffe5b0ca77f8f169ff031a28cfab29fd9036d0d7
font_01_sfnt_off00011c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B1 10320 bytes
SHA-256: 01e09ad2445bd516ea7387507ae81890a88e1ce79782e3787563fa6aacea703f

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