Malicious PDF — malware analysis report

Static analysis result for SHA-256 83fd77cfe438ceee…

MALICIOUS

PDF

67.9 KB Created: 2021-09-26 02:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a3ea27067665421084ed44d5495bfc16 SHA-1: e607e0f91e6c274c5d9361482d38046f6306eac6 SHA-256: 83fd77cfe438ceee25056d2319d64b539fecf71eade8b8b1043a4c9e048f7aea
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and presents itself as an image-only document with a click-outward action, typical of a phishing lure. The document body is heavily obfuscated, but the heuristics indicate it functions as a link farm pointing to compromised CMS upload storage and disposable hosting, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://chcial.ru/uplcv?utm_term=walking+dead+gomovies PDF link annotation
    • http://agilesolutions.in/uploads/68895152015.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/76199168827.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/zadunekoboxabozanojapa.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/zumogifixawuzo.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/fuwowodenuzised.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/60866697781.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/87914572889.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d61742b332---35967679909.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/42392651344.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/mexamofavisod.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/gatubevevime.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/18443379036.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/xenalubuse.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/11065068173.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/10808289948.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/8215a4d5307744955faacc82adbe157f/71848279023.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pogugawabudok.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/nasiberiruwepuzogufo.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/vulafesitipomunigara.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/15310391168.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/95519150688.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/81406782628.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/86339766837.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021092523541061.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/9b80c14286492cf48401e516d2abbc54/dixoxewu.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/d16b60d7a03335326dfa60c2200f76f8/munenedeze.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_off0000b0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D7 10544 bytes
SHA-256: 5c7bad5ebc799a6723376302e2d464e3c3f912571fb1a424323c269584602770
font_02_sfnt_off0000e09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09F 13712 bytes
SHA-256: cbab096e555ea18049f93e035d42ffe3ff8593895b0deeb3ccb9a6865600bb73

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