Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d90220783200b42…

MALICIOUS

PDF

82.3 KB Created: 2021-09-20 17:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 15c5137a3ab7004e26c94d797d621d61 SHA-1: 186e6f442d989caaced2cf6a2d3ce6a8295ac0e1 SHA-256: 0d90220783200b425f42d3d721d4a774c84322dde8eb822dd96b5d8cd85d1fa9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate that the document is designed to redirect users to potentially malicious websites. The presence of external URIs and compromised CMS upload links further supports this, suggesting an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://inwebjor.ru/uplcv?utm_term=descargar+neoragex+para+android PDF link annotation
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/45661151579.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613141644c567---50414586109.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/waxesesuwemefilugibe.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/164358e1279d69ae7a6cd7c4a0ff54ff/62785343923.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/kivulogodoluxepetosulu.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/puvesulo.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/90688266857.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/virozewegosaloxanemize.pdfIn PDF document text
    • https://timavoshipsupply.it/userfiles/file/kowivamuge.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/jegamiwiwel.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/66457915895.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/2046242747.pdfIn PDF document text
    • https://securitydm.com/slicice/file/jusivalaf.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/41195521256.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/97515616337.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/399f8c584f5d3a5f93d1e9269b8f73fe/41005775773.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613286ec045da---38929447036.pdfIn PDF document text
    • http://rnralpha.cz/res/file/serimevuzokezuwabi.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/18607957798.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/laburukuwo.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/13396106495.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/vumazodag.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_off0000da27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23E 10648 bytes
SHA-256: 773c1fb0f24d0a58d085f49e28a9bb8c00e56eb625f589cd5b24959f8eef3323
font_02_sfnt_off00010a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8B 18988 bytes
SHA-256: 6692340c194151dc74727ce0e055e9a70bda9ac845389d007d6628365c3f1d09