Malicious PDF — malware analysis report

Static analysis result for SHA-256 d316d0e8c4c31325…

MALICIOUS

PDF

108.7 KB Created: 2021-07-09 01:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 70c4ae92a28b5864b438b5a7592ceadd SHA-1: 0f4878a85ca1f5b401de65bf3fc61a410fe08d13 SHA-256: d316d0e8c4c31325dfdcb0d1d23e2f6952a0eaf09211b93ddabd11ecc210b551
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress upload directories and disposable hosting sites. The embedded JavaScript likely facilitates the redirection to these malicious URLs, aiming to trick users into downloading further payloads or submitting sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • 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.
  • 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.
  • 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://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b939f21ff8---xunevavixolubuniboweluvik.pdf In PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c2c4dc721---paromosolenolo.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/64466634173.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82fe78fcac---zogepinazitujapokopoti.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/63486877234.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/furufuxobesiwiduf.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56269395bc---sojofavuvetas.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/33848746784.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095657fd3a3b---dokalatakodivuli.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/ga55c63d13ca1skistvc7u7ac4/66294770177.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/22693155247.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/62835c63abf8837f228fbc26f45ccdff/82339331125.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607418c3c0e89---56806480916.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/revugonoz.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/favenow.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/tozususeketosumapogazaneg.pdfIn PDF document text
    • https://tipresentoio.it/images/file/nuwipuka.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da89f001bf---nokuwitoxobise.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/52886957952.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/rezutuveronowoj.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/6b32ed6eae9c1f01748d420b1755e5b7/17111192425.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/gt2mmlgr0qphpgd2jp1skrq0up/bidegetu.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/b6c63796ae429b43e5f58146c1266dd3/34321753274.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/fobufojeloporir.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/baa4a3d7b8206a2ecd268fcfe89ced61/63774962475.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bab2fe8050---64698822275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=sample+f1+visa+interview+questions+and+answersPDF 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_off00014504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14504 17608 bytes
SHA-256: 17234bbfcb7a60044e041ab1683739f91b057e288dba1a79d67be874fc6cdb2b
font_01_sfnt_off000172bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172BB 11184 bytes
SHA-256: 2192a72984f274767828417597e9e9ab75e55baa0e93add86a9c591040bed271
font_02_sfnt_off00018cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1