Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1834c7d921a533d…

MALICIOUS

PDF

71.3 KB Created: 2021-10-01 14:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c8f9f0d00a6dd6f2db2aac8f43fbbf6b SHA-1: d0a28ca17fc8f58895af648597961aa5bcd3df3e SHA-256: d1834c7d921a533d6524b92d7e406a06d544091b84ffb6ae2bd5b6291a80a663
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised WordPress installations, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or exploit execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://drafthe.ru/uplcv?utm_term=san+andreas+game+download+apk+obb PDF link annotation
    • http://ashole.hu/UserFiles/File/79655017860.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/70471544652.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/zefunatemanugusipel.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/kovosimodim.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/94780815083.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/xiwad.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/nuxemerojofezagef.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/deluwurovamalupog.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/vozipubanuvitokufabi.pdfIn PDF document text
    • http://hzyixiangchem.com/upload/files/21663451829.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc1fd513e4---26338871637.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/badupulanurokomowuvi.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/64929316960.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/44291873376.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/negutafimolo.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614637e94ee96---77906711456.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a7efa9e9e---jexiguwezesetodu.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/60260059296.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/giwukadowezafarisemagudiv.pdfIn PDF document text
    • http://premo.at/userfiles/file/57403989204.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/xawidewojujoxenigun.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/40778a3cf83b32d7428ba59518349231/76153579314.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/sefizeki.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_off0000b2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B8 16972 bytes
SHA-256: 7de26d6686f7e14b8354ff89862a21bda61754eebdcc13bb4ad7c0ace0f24d4e
font_01_sfnt_off0000de1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF632 10936 bytes
SHA-256: 6b6b2d1d9162b37972a82efb9782ead6b620214a2466157b74b1b99203ffe790

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