Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89333f63901e29b…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 01:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2f77a586997dcefe2eade6804a43a575 SHA-1: 758a2030d9aa0c6eb10339a88097485c088d092e SHA-256: b89333f63901e29bbb5c4cdefa6cd1e054ef22268a255b8cfed3609333ad8a7d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many embedded URLs pointing to external sites, including one hosted on a compromised WordPress upload directory. The primary attack pattern involves luring users to potentially malicious external content through a series of indirect links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://takarasushimn.com/userfiles/files/nafotugimabo.pdf In PDF document text
    • http://chromavials.com/d/files/gawujepeboroxigovo.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/finijiwepotugezerefi.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/dojegakabenipawoziki.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/baritijukexepefiliz.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/12394648154.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/pugojitinuradesasad.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/81114882328.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210903_01B0A5740CBEE80B.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614573cdbdf8c---54368823927.pdfIn PDF document text
    • http://hotelexpert.ro/uploads/files/wawomejafimizapadoluzisul.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/ragasuterafo.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/75888d57bb19552517b275f561e0f97a/46738190446.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/60924274563.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/65555894657.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c64d416f8a---gokegonulevugeja.pdfIn PDF document text
    • https://projetovm.com/uploads/files/tosetajudugezedimasowo.pdfIn PDF document text
    • http://montesantangelo.it/files/files/lixefotitetovesi.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/97498905911.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/78539969894.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/2500750586.pdfIn PDF document text
    • http://royalgroup.at/tmp/nexapibudogabesufat.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349203543fe---tafolovaxoxifiriloro.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/20972380546.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=android+x86+dual+boot+ubuntuPDF 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_off0000de6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67F 18832 bytes
SHA-256: 3d8813e2abacc490cd1fbfe9e862ae29f3db9196711e5b5f921750a085eb3839
font_02_sfnt_off0001273e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273E 10640 bytes
SHA-256: 789f0a398876df4f9a7aa55571ac06c000395e93246026eec97176da9dbb5043