Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb3babe94a04f0d9…

MALICIOUS

PDF

70.1 KB Created: 2021-09-13 07:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e5ae4e685914939d5a6e8deca2477b6d SHA-1: 2c2527f8511f854102b5d86d4fdadd355386489c SHA-256: eb3babe94a04f0d982c5922be6ffdab9388b87afe6714539388775b0d1130c5b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1bf36353d---32986623226.pdf In PDF document text
    • http://bukhatirhomes.com/userfiles/file/2393395057.pdfIn PDF document text
    • https://anfauglir.com/images/file/22744661509.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/zetur.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/43372275855.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/1026185022.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbd4b8ef4c---89409535041.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161349ffa3b928---fosipegir.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/92262369090.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/97511949690.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/cc8e2735f082de83a433ab6b121d5edd/zejiripepowinokowafu.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/rabagujazezebudozuwe.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/vodalatap.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/penebazinuvavipov.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/61693901148.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/padagatiri.pdfIn PDF document text
    • https://tempegaring.com/contents/files/53049046985.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/0d4c191ab31f1412cabcc62789386472/gukibipa.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/98098007899.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/wegisozexugafi.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/47344016086.pdfIn PDF document text
    • http://learningkey.org/userfiles/11332155426.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/93422363885.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/97344593996.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/83142165335.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/gubuzogaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+get+black+emojis+androidPDF 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_off0000b526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB526 14296 bytes
SHA-256: 38cc5e22f3af567ab36b02bddbea0a9e1d42a1e8153d3b57e27d9414a9834908
font_01_sfnt_off0000d8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CA 11152 bytes
SHA-256: 34f64f702f0f94c434892f715f6b3074f420207454b871720db8ec160cb9e005
font_02_sfnt_off0000f29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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