Malicious PDF — malware analysis report

Static analysis result for SHA-256 40371d5c88b1b88c…

MALICIOUS

PDF

75.9 KB Created: 2021-09-03 11:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 52981d9611010a389b3867926e4920da SHA-1: d3564665f3dc62914888ce70f61d71aa1ae34c35 SHA-256: 40371d5c88b1b88c776ba0d9450bd646b12e752208795f4fd16b3a0026762030
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves tricking users into clicking these links, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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 http://hostingureitings.lv/uploads/userfiles/files/52133172418.pdf In PDF document text
    • http://tuderprogettazione.it/userfiles/files/paxixuwezafopoti.pdfIn PDF document text
    • https://somogyplusz.hu/files/posutodupelis.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210505192345.pdfIn PDF document text
    • https://abeess.com/userfiles/file/valileratire.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/22686862304.pdfIn PDF document text
    • http://fedime.org/imagenes/wodutoroxefonig.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d7c26673afc---2049447447.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/zisasepi.pdfIn PDF document text
    • https://umartravel.com/files/63070753695.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6eea38eaab---36586610238.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/51266921021.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/6d5b4ab7b931469e2639489e82d71e07/nagenerus.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/81643693753.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021060501423430.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b40e0ead62a---ragikijevunokoredemipix.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/98550400591.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/puxotodixal.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/rerawisokimitemutegi.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/de5491bd464d2603b4c00ea233e7f824/fixodesesopidifegeba.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/wojokepurejodigovabudi.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/h26gkpijnsrqnl8g20mcv9rcm1/dosewobore.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f642baffa---25401776630.pdfIn PDF document text
    • http://nensi.si/upload/file/nusewini.pdfIn PDF document text
    • http://rotang.net/userfiles/file/darebegireg.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/67150410637.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d500b8278ce---vinanovusibipewijas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=descargar+diccionario+chino+espa%C3%B1ol+gratis+pdfPDF 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_off0000bf5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF5D 18068 bytes
SHA-256: a07ee7b0fee35f86d38e1e9ad53b2aa54a6613e9339a8aa9a70db7e278849566
font_01_sfnt_off0000ed58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001056f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056F 11104 bytes
SHA-256: 1aab24259256caf17408950a7c04398cdbd7d50e39600d8aec242f6a121ebcc8