Malicious PDF — malware analysis report

Static analysis result for SHA-256 6484fc9845bb22f5…

MALICIOUS

PDF

69.6 KB Created: 2021-10-01 11:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4edcebaf25343bdb03eddd9365eeabc5 SHA-1: fdcaba0280f8fffa1505f6acfb375f8692dc04ba SHA-256: 6484fc9845bb22f53471e95b7a47dd16dee06361b6d2ba8d949d44f87f8a77d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing or malware download sites. The PDF structure and the presence of multiple external URIs, including those hosted on compromised CMS uploads and disposable hosting, support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://lpxs168.com/filespath/files/20210928194717.pdf In PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/wifizitadizirozakige.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/10521082375.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/lowakemuwaverebukore.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139891a8a6d8---wisujirutazaminexozukab.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/siferil.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109141905039070.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/fa9363f8e2e4f95590b57b6a4ae46bf4/27888530095.pdfIn PDF document text
    • http://biographiewerkstatt-singer.de/userfiles/file/46582725903.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/39651475822.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/bojese.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/6c645717681fd51795bc6223b8389dc7/xupekab.pdfIn PDF document text
    • https://norservis.info/files/files/25576759467.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/dobidenaxuviwurojalawore.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/0636fbd2b892b903cd33ecb62745611f/birad.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210907192338844.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/jipokuduvizodufomuwaniros.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/72696010367.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/47498593064.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/24348643300.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/bijoxotutibegototami.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/71721063865.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/55511977361.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/babuleko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=one+piece+dub+watch+onlinePDF 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_off0000af38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74A 15648 bytes
SHA-256: 2ed0b96bd9bfabeb80ea9d21b73a1ee7c126bb265e1b9e53cfb8f6606b418d03
font_02_sfnt_off0000ef16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF16 10692 bytes
SHA-256: 2f2c91b096d51d1e78c370d5e4338f00c6c03d45acd69306476894a6cc97a1b2

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