Malicious PDF — malware analysis report

Static analysis result for SHA-256 58856c57af1d4672…

MALICIOUS

PDF

81.1 KB Created: 2021-08-24 04:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 06e3aa04c53dab7ab40941a7106de9cb SHA-1: 0911640759dea816e5e74c7c619f2021f7351f2b SHA-256: 58856c57af1d4672fe822dd05337b6ad80299783edc9f49e016ddccf2bb80099
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and link farm heuristics points towards an attempt to lure users to malicious sites.

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://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/sfho6q94g7qprm9mann8t0urui/gikirajejajaletewuxapuwum.pdf In PDF document text
    • http://gintaras.cz/userfiles/file/75042695079.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/26878248950.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/xaturefokukofufemiwo.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/72693036283.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160932ad4cddee---64565718777.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/15764706941.pdfIn PDF document text
    • http://minicabii.com/survey/userfiles/files/kederut.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/hohohetvcf0qgg5ao5rievd6pk/28299455259.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/f6b0d45ca16ec3b2b584ae95253aef47/4470797607.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fed246b7f0a---muzetidixolomokiru.pdfIn PDF document text
    • http://3sdent.com/upload/files/leromen.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/mikujowizu.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/83766776884.pdfIn PDF document text
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/zugetifitox.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/83829061443.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/22215101004.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/sanosexov.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096721794025---44474966067.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image//files/87221885896.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/4338752217.pdfIn PDF document text
    • https://777mto.com/contents//files/katavogiwikerap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=yes+dear+cast+nowPDF 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_off0000d8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EE 17908 bytes
SHA-256: 75f9a9cb6ed7f3553d7d3e1fa2292fa27da5ad4b36f21791d3b5cc8bf8fe4c22
font_02_sfnt_off00011f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F93 10292 bytes
SHA-256: 97d3ce50ddfb02badf7503e7192ce7227615e386f789ade20a6bd053df53fdde

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