Malicious PDF — malware analysis report

Static analysis result for SHA-256 99bf21699a8cd251…

MALICIOUS

PDF

73.9 KB Created: 2021-09-07 12:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aacc38631ca4c65639e8d793eb01f20c SHA-1: ce6005f2509e70a3708d01824301c132a9555853 SHA-256: 99bf21699a8cd2518a6793306cf2d278242840555bc95a81f62ed7fb31e6e357
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be directing users to potentially malicious content hosted on these compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://rauvuonsach.net/images/uploads/files/watokelexutoxitos.pdf In PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/f19278b06740142d89b6fc43bb09abda/94698688837.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/nubofuxi.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/sulokel.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160984c43c2ab6---24798194957.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/16415577860.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607227ca45334---64300364269.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/676420049eceb1f1c1c5519437f8bc5b/92927497418.pdfIn PDF document text
    • https://cubic.is/userfiles/file/jolajirigizolesi.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/jifizuwubafosirefuke.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/9558066015.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/tepeluxalagadafajipod.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/e8afe2ad5dbe29979ce416c3833370e5/82137148115.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/wurivukapisafavij.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/80100182388.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/dixulijirugafikuxipa.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/74c3e01d5ea06faaa71b8b663a56e079/45084451655.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/42587959635.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/61217470104.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160aa29fb50bb6---vojajujizevigimaf.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/bexusawakejubidefof.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be39aeb8d6---25605908923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=one+and+two+step+inequalities+worksheet+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_off0000bbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E0 11044 bytes
SHA-256: edaa52530f31cefd3e1b37daec65ac84548d26fc617dcdc6e3b9e9b4e16fa86b
font_02_sfnt_off0000ed63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED63 17180 bytes
SHA-256: 3780d5d8213aa3d46df212aedbec7dcce698c2d6e8954f2538c21bbe26a64eae

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