Malicious PDF — malware analysis report

Static analysis result for SHA-256 174a93107962f98b…

MALICIOUS

PDF

69.6 KB Created: 2021-09-17 10:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9c366cfc4667e85677c9f96a2a597161 SHA-1: b823df9f75680cdf885e8e55a1f5e67fb913f024 SHA-256: 174a93107962f98b045df63a02de3d63648eedeef7a2fc4bec0835de241b5c58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious content, likely for phishing or malware distribution.

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://pistant.ru/uplcv?utm_term=urutan+os+android+terbaik PDF link annotation
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ihcs3mie9keqm5adq5e0t6t4f6/kobopu.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/e28877f234cf64d0c8e67071a32116b0/83867868172.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/34574049807.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/58079141265.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613587392c3a3---tepimatodotagamekodezuja.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/vefazedaletomew.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/vorirelesabebajepu.pdfIn PDF document text
    • https://photojet.net/userfiles/file/jutemopifa.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/88554227962.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/24248103020.pdfIn PDF document text
    • http://itena.si/uporabnik/file/menomo.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ce0b600cf---wifofedulawejugelogu.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/54363738294.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/figer.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109141428289902.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/kujukotipafutajewezo.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/lifetisojisamo.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/13958370140.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/90001233863.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/pupagigegotofexipiliwoput.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/85889289206.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/10711492280.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/lolilibawufevijosejile.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/ranojar.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/47818507259.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_off0000b420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB420 14720 bytes
SHA-256: eee6d0fc0352e4036d9ddc131ddd7d1d6cb707a06365be000d486a387d6a58e7
font_01_sfnt_off0000d8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C0 10532 bytes
SHA-256: d4dc6f33f7850cacafc384709e85bab755a35cfe22d40ea95f30ee69a301c983
font_02_sfnt_off0000f0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1