Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce773d92ca33369c…

MALICIOUS

PDF

79.8 KB Created: 2021-09-20 03:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 952baf892a2a8bb04dc26bf2fe64247d SHA-1: cd1c33ccd2f005e49a1dbe2ec9763fc11fde7262 SHA-256: ce773d92ca33369c51afaaa20078e11a1eb8f91413548488faff1685ced402ec
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm characteristics indicates an attempt to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://infrive.ru/uplcv?utm_term=get+apps+download+apk PDF link annotation
    • http://boek.se/bilder_umeny/File/48419455555.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/72120891480.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/jewebo.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137be8a989f8---jexidip.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021091213462770554.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/5921661399.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/mopomovo.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/xomalewaxiditonem.pdfIn PDF document text
    • https://anaksemut.com/contents/files/zuvokuba.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/kivituxawix.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef454045b0---rifegupimudiwad.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/99784094679.pdfIn PDF document text
    • http://puisan.ru/uploads/file/5445668142.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/29040956973.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7efb41824---40326841180.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/35357854530.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/jarixom.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142dd4edd28a---51571656927.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/fabavokawijetejebunukuxe.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/jenavedajepukipifogosomul.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210907110350.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/95380437120.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/85470805566.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_off0000d5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC7 17084 bytes
SHA-256: e4734a04e221292bba4922ba29494a24a1fa95ac25a52ca21eab600d5f61711b
font_02_sfnt_off000119ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AE 10412 bytes
SHA-256: 986abf8b5472d94ee47fb95a59766180b070770f7b2f15418c87fe78872a78ab

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