Malicious PDF — malware analysis report

Static analysis result for SHA-256 89f93e5ee868043c…

MALICIOUS

PDF

72.1 KB Created: 2021-09-07 23:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a7f00e499f379c7164b346025547c6fc SHA-1: 3883c800c161a02dbe91d799ef230ac8593db9df SHA-256: 89f93e5ee868043c88fdf66c019c2cd81a571ca26ada3cb05673451fd22719b7
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. This suggests an attempt to lure users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://allmassage.net/upload/file/20210530121126.pdf In PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160dce22ea0f56---paledix.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/gojobevinoresij.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb45795bd5---depubavexotolidusofivala.pdfIn PDF document text
    • https://lesura.net/userfiles/file/zuvapedumatilagef.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/f2ed13ebf2f4cf858955beb464d6a2af/nawuwudikidebifo.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/telazibogebi.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/77781656.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/pexinadar.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/99890696582.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/93951837445.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/17887439856.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ca6c72039---rixuvorinotewatomaluni.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/84753209930.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612696e58ec82---40775449573.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/vuvedimilos.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723f5db5c24---lijiril.pdfIn PDF document text
    • http://17njl.com/userfiles/files/bazodoxigigovuwudo.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/45203397886.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/60524138754.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/vusetex.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/fagibifipomuriwezujitam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ncert+book+class+11+biology+pdf+downloadPDF 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_off0000b6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D1 16184 bytes
SHA-256: 4317ef941e2f599e3c8fd9d994a9ff8d9eee1040388b455525ff9bc9a74d8142
font_01_sfnt_off0000e0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B9 11256 bytes
SHA-256: ea54279be5a61000e05185ccb56f084c742460bd946e40243c0672fd96a613ab
font_02_sfnt_off0000fafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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