Malicious PDF — malware analysis report

Static analysis result for SHA-256 d412e59fd4d571bc…

MALICIOUS

PDF

77.1 KB Created: 2021-09-18 20:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 92a7eec875746418f4e1a2ef2f7b939e SHA-1: dcdf4af9c4fdbf61c1802d417d54e324c359c4b3 SHA-256: d412e59fd4d571bc05da0b6b4efea502d83cf25583a64aab6674eac9fa2b6d15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various compromised or disposable hosting sites. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://allytemp.ru/uplcv?utm_term=how+to+change+print+size+on+android PDF link annotation
    • http://balbu.hu/uploads/news/file/67663186615.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/gefiritisorejozadexa.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/700947c59658fe486ef47bd5f5890607/gikotuzesufojokipebopilu.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/bajiwivolonige.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/14874466084.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3d6523f82---suxakunizivamed.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613707b039892---1344579853.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/tosirinuwovefe.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/patuxunevegilodomowirixif.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9086a3ef8---78085022347.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/zuson.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/49051135603.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/nesutepulegin.pdfIn PDF document text
    • https://steammining.com/userfiles/file/gijavumavidaratilunel.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/xozaziwusugitovexegomo.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614343af185bb---xuzupupomo.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/26413637774.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/pukisawiz.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614254315a670---56169923523.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/pikatavusamab.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/12475857810.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_off0000c816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC816 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE028 17672 bytes
SHA-256: 39aba339c5c57498c658b2ba14a4791dc5036f24a9cc90f3a521886573704cfb
font_02_sfnt_off00010e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0B 10884 bytes
SHA-256: 4471f35a082bedb5697aa808ad3682ae0e471aa14296ffbcf78f3ea8a501df4d