Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeb0ea7fcf6f0ad3…

MALICIOUS

PDF

96.5 KB Created: 2021-09-02 16:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 43bd1d91cdbcd38ba795e03dc39062fa SHA-1: d6a775a188df0fe35e333acf300178a844696652 SHA-256: eeb0ea7fcf6f0ad366fd6dcf50b28982e73862e6b450da742431f39694f02e9b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to lure users to malicious content. The presence of a URL with 'utm_term=mankiw+macroeconomics+solutions+manual+pdf' indicates a lure to disguise the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c1992135a---60948467954.pdf In PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/1a43e43ac06df32920102a55ac81b021/46344611407.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210825080546.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/9076485304.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/pinixemi.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/87328508573.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/24717901005.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/49480287616.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/52380560676.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/178d87723b50aa37137c031a16fc0bdc/17671389318.pdfIn PDF document text
    • http://teraval.cz/res/file/bitunokas.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084e2503c6a3---26800816548.pdfIn PDF document text
    • http://domplus.su/userfiles/files/73209945647.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/b3vp0t7nl4a4rnf8ael33rhqov/xopuxu.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/mezotepu.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sajofodixajejofaba.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/vnvv8o7p39q7dqcef581cje6o4/33233582380.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/2593da46abbb479e6f5d09f8d7beeee4/83195602873.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/22106669744.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/dakoxonadutatokefulufufud.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/39669er12kdhci7derh62i3bj0/98803258099.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/91543098959.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/zabenapado.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/jerawoba.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/zatiroralemovulerasupov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=mankiw+macroeconomics+solutions+manual+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_off000110c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000128d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D5 18804 bytes
SHA-256: 3eceed19c2e066dc5c9fca7c74e2a013add4202c6165fe7ec1699a2f4763aac8
font_02_sfnt_off00015a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A1A 11052 bytes
SHA-256: de92bd5ac41f06273221fa0984ab487e92a42450f66daa2c951a36deb6d9eb2f