Malicious PDF — malware analysis report

Static analysis result for SHA-256 eded96315f83d281…

MALICIOUS

PDF

81.7 KB Created: 2021-07-30 17:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b1153f649d8d93231ee6295a26e680d4 SHA-1: 824b7b045b7663c1a90eddeb8d29f76e9d8263cf SHA-256: eded96315f83d281c4bcee5a851947062bf871b6fd919971e0beb1a74d3e2593
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to phish users or redirect them to malicious content. The primary function appears to be acting as a link farm to distribute traffic across various potentially compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 http://alphasigmaoverseas.com/userfiles/file/rebujafitotu.pdf In PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/31700026186.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/duworugatikisowojizi.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cef1b1d9267---40092469308.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160f2c96e1932f---mezojodoseweziluxagisewek.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/20216263328.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608de061cbc78---99359282029.pdfIn PDF document text
    • http://jngf.cn/files/file/49149573161.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd8aa45468---gilifawevavidokoxolosuba.pdfIn PDF document text
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/watogitizukinarebuzamu.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/8811410680.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c58609eca---22143034381.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd362e71a7---10128108262.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/5102588396.pdfIn PDF document text
    • http://btfa.tw/upload/files/xebunusararaxadijozil.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/kazerupepikufi.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/85503328605.pdfIn PDF document text
    • http://abpaluso.com/upload/file/fajonadunaruguk.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096354f412e4---tuxifufovelefozalufiwilu.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/2a8fd09640b1a65e178ea2e23da719d5/tukigabukudi.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/fmi4o0q12logrignofikt8qk84/todusawopofedexutu.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/davolujomuseraze.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/7434969252.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/92153649085.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a65b7c5b661---zejigibabinizugogutiroxob.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/83447517496.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=lyn+sharratt+clarity+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_off0000d9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EB 10536 bytes
SHA-256: a3681b6143f18991405bf46c596ce7f9a4ab15f202a5e1ef68f1444e4046ffab
font_02_sfnt_off000109cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CC 17980 bytes
SHA-256: b66c6df7b39e2ec2c8936c0740265ff9c74f55b20c9c25a863e9080dfc3a6b73

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