Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c00457e5eb265e…

MALICIOUS

PDF

104.4 KB Created: 2021-09-13 16:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 93fdd0f2d36248b5171876b920d885eb SHA-1: 9c3615324f418ce2ab66b6611557d832383adbe6 SHA-256: 28c00457e5eb265ea026e3508e9d14b0d38f359aece356784137950f7b62675f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also features a link farm pointing to multiple distinct hosts, some of which are identified as compromised CMS uploads or hosted on disposable domains, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://budohurtsa.pl/userfiles/file/welobomewasijasawiwiwugu.pdf In PDF document text
    • http://www.uc-kushiro.net/images/library/File/13335571666.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/88811102710.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/pvhqk8ctgulotbr021492hg7p6/22557203888.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/63122313729.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210910124809.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/23804399180.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/87063491105.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/kejovo.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/disesuxobamuposul.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/4009763892.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee1795ff1c---bitesovi.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/6291530848.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/29009041077.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/puwepadupitepata.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/d159d062661a8f660854f25984937fae/55522099785.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/desejef.pdfIn PDF document text
    • http://bscartridge.com/pic/83088388029.pdfIn PDF document text
    • http://seamacros.com/upload/file/vunabuxuzip.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/18415641460.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c400c1377e---latiwufaxoxajiloxakesugi.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/nisodanojavos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=orwell%27s+1984+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_off000132c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C1 10568 bytes
SHA-256: 143c378b7b6546d825ff1f0c45541eb4c6bc388b361f17c44b8b2d1868a9fec1
font_01_sfnt_off00014b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B3E 18744 bytes
SHA-256: 81f111edb7c1a23b83c96677efd1d6a0da0aa35783a9a49357474ddf66637874
font_02_sfnt_off00017c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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