Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53444d64a1e08c7…

MALICIOUS

PDF

86.4 KB Created: 2021-08-14 04:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 5b50c3da83552829f45dee4955092204 SHA-1: 4bfefaf2f1faa187f36b722e4e494c5d25ff03e6 SHA-256: a53444d64a1e08c7ef5cf6c3ced8e673e68b7f767e453a0bb0ad007bbba84889
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly supports this attack pattern. No scripts were extracted, but the document's structure and embedded URLs point towards a phishing or SEO-based malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ajitcoatings.com/uploads/60980470589.pdf In PDF document text
    • http://msslink.ru/userfiles/files/fewerotadotawowotoxi.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/455876363.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210801104820_c2FyYWJlbnV4dW51.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/famiwu.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071aef8acfe2---44736532541.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/59578212519.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/dujobanowanevowupew.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/rekomipuvuvokutonisi.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608797d1a2620---32737867580.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/98674549252.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4a33fbe2b49b79a2f1e1e3e03e626dd8/75440102765.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/41390204840.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vr3r6f93ntpk19jjah47lun375/19576923281.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e2b2441f8---dikubitadefamapi.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/e2bf10d0fa9f70a99390b91eb5bd213a/vidabofelure.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021060722230016.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d73cb846e7---fozuze.pdfIn PDF document text
    • http://valeneighbors.com/userimages/27309236553.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/00sgttqtjgn0el567225546pna/40853852046.pdfIn PDF document text
    • https://museos.comarcadelasierradealbarracin.es/ckfinder/userfiles/files/nawoligobasedezewilazoluf.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/37794151307.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=medidas+oficiales+de+una+cancha+de+basquetbol+fibaPDF 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_off0000ed09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED09 17120 bytes
SHA-256: bad7f26df39760fbf48d76eee426d54fac4923f7ec09fa022c26136c543c8850
font_01_sfnt_off00011857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11857 10852 bytes
SHA-256: 103f46b1f2d803a0158a7342d7c1fcf961195c6a9bd0941e837071098c6306ed
font_02_sfnt_off00013122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13122 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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