Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27809bec03fe292…

MALICIOUS

PDF

78.1 KB Created: 2021-09-19 03:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7b78ffb4d4e20a94a0121966680d3288 SHA-1: 00bfa55afbb3e8baf6a39950a2ea806811b5c83b SHA-256: c27809bec03fe292b22aa6f5fab337018b95b80fcd7e93ce96a560929f765789
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to potentially compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=vyprvpn+pro+apk PDF link annotation
    • http://gourmethousemacau.com/UploadFilesfile///ribepawovonawaxasuk.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/473f792cd7f645f3d1065b7f62f8f759/nozazora.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/xaporagawirofasopavug.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/11544428474.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f819ad0ec6---55769270565.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1613a37c119d81---xolesidawum.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/38058375657.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/31470208998.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/vaposudedusibopurofukep.pdfIn PDF document text
    • http://15881588.com/ckupload/files/bizopaperifaleganamusilaf.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/mapasazumap.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/7308225200.pdfIn PDF document text
    • http://risme.vn/files/gufuxobikowopigejovi.pdfIn PDF document text
    • http://ailizia.com/userfiles/17003316217.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/mubuxona.pdfIn PDF document text
    • http://artepcb.com/upload/files/pomidanu.pdfIn PDF document text
    • http://polletnv.be/uploads/files/334114942.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/givipelasusizefikeguri.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/6dc0f057e66e08841ca8473e5af1c5ce/43494067585.pdfIn PDF document text
    • https://rippa.pt/files/file/6770807275.pdfIn PDF document text
    • http://ruihuitax.com/files/file/jezux.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/fekubidogujinowupo.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210909203836.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/23315883179.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/1780398601.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_off0000cdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE608 17900 bytes
SHA-256: 081230f65d09098195a26b1021699b0dafabff5331cb6d5c8335e0090d05763c
font_02_sfnt_off000114b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B9 9948 bytes
SHA-256: 1001c5622a949353430b727ee111b068d0d891e5e6d2d99ce4a87f78f1cb5ca9

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