Malicious PDF — malware analysis report

Static analysis result for SHA-256 eec60163629f7a39…

MALICIOUS

PDF

85.4 KB Created: 2021-09-18 08:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ca67474ff8e5ecc11306b46a941c41c8 SHA-1: ab48c53600f8d8e1b613b3541f3df680fa72a670 SHA-256: eec60163629f7a3900cc3cab2e8b7575344c45eda60184ae0b8fde761b130a34
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, while some are marked benign, contribute to the overall suspicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://lixupeng.com/uploads/files/zepepe.pdf In PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614473baf0ade---61805079081.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/nixexufo.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/jelowebojonubaxomuvoteri.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/54336861400.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/nigilokavexegamubowove.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9763e73e3---12742414176.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/besawidafes.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/diwawagujawanivelumo.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/63268952898.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e9ef5d842---potorikifan.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/wijawazumogaxitovabunuwi.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/58809583623.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/51672092446.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/7768354842.pdfIn PDF document text
    • https://phr4u.com/files/25216830425.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/78140014201.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/28220746018.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/14318545274.pdfIn PDF document text
    • http://agro-partner.com/Image/files/befaweza.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/38503897119.pdfIn PDF document text
    • https://ms2oke.com/contents/files/40578197355.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=spooftel+android+appPDF 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_off0000ebe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE2 17180 bytes
SHA-256: 8c62a1cbed4e5be227a767e9447494cf22492e3b006fc526cd3b0affbcfb3aa7
font_01_sfnt_off00011835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11835 10400 bytes
SHA-256: 42bfdbb12d4cd9360220c1a88a11d305b82a4815a0998248ae957eb037ae4c43
font_02_sfnt_off00012fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1