Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ae5d6a3ddd1b5a…

MALICIOUS

PDF

88.1 KB Created: 2021-07-09 01:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 056d65eecaeb9933ebfa210921f60866 SHA-1: 2fcdfe39039c3f044b7ff29fcd9ab2dd2fccd2f4 SHA-256: 53ae5d6a3ddd1b5a62df997f7897108908353dbb8e0377dbc75b46c85fe873f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=potential+and+kinetic+energy+roller+coaster+worksheet+answers PDF link annotation
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/ssglprqtc4jp7ne9q35s9oru80/62465958148.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd8bd8cad48---gozuti.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/69330903840.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca015a476d---zunisoregokuni.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/71671850976.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/ej92n57228d1bn48pbqv9ljpc4/lelil.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b73db7943---53704197730.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/25346375193.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/nituxuwivujeram.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/degereropeguferavawe.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52358535177.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/89df2470daa2925123fad4c07ee3bc58/16233202629.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/milagujesaweluvulaw.pdfIn PDF document text
    • https://isleo.com/i_photos/file/sejidinuvizosetibuk.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/lipuxilax.pdfIn PDF document text
    • http://skomi.ru/img/files/file/tiranu.pdfIn PDF document text
    • https://motacademy.it/file/jeberijak.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/salizinizobogokovok.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b254fd2f74c---62955101269.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/xobawanakojibez.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/pudazolexenixisevikel.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/97089140155.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce357c2493---naxiwidobumop.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/8576632512.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_off0000f5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D1 16644 bytes
SHA-256: 9c6332192c5cd239e0ae61c8ca33ea34b26254b7c1c11ba2e342d7700fe56ee7
font_01_sfnt_off0001213b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13952 10940 bytes
SHA-256: 8262948214fd74ab8544b0e8e76aaa0cac371d36955ff2016f91f43b5b41ee3a

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