Malicious PDF — malware analysis report

Static analysis result for SHA-256 47cd8119430e52c1…

MALICIOUS

PDF

78.9 KB Created: 2021-09-19 03:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b0122e5aaa51458fb6a570b2c1c57420 SHA-1: 97f31d8d67e87b3169e103f514bcb11ca05eda17 SHA-256: 47cd8119430e52c16c7322ec5448fa44239557366d00257f7083d35478a4fc91
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting an attempt to lure users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings strongly indicate a link farm designed for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://mrspk.com/ckfinder/userfiles/files/delosito.pdf In PDF document text
    • http://zenkatsu.dk/files/bigedenomi.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1614433689bdf3---8723451775.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/poxexevevufedofenejenuru.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/88395345108.pdfIn PDF document text
    • http://exima.kr/userData/board/file/9799768955.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/53079090801.pdfIn PDF document text
    • http://esen-life.com/userfiles/file/89497726495.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/59219869204.pdfIn PDF document text
    • https://war-old.its.vn/new/userfiles/file/xoxusevi.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/nigoxodurajuvudikum.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/38227125547.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/550905056.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/15187962000.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f43371ec3---modemotunezosufunejizowim.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613619936291a---nuwodukef.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/0d3c8ae6e4e7c10b9d82e96fcb4bfcee/jepivova.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/gesosumuva.pdfIn PDF document text
    • https://costarica4d.com/contents/files/24663188408.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/23541567824.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210916135120.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415c0e63b16---31814376432.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/54344374377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=oxford+student+atlas+for+india+3rd+edition+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_off0000ce56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66D 10892 bytes
SHA-256: 49f1c23edf359a4a54444480612b229f7fe2239f000d662f3e1741ca9730e13f
font_02_sfnt_off0000ffcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCC 17460 bytes
SHA-256: 416aa428efb47031e9c57e4ed41a95362566240ec9c8cffabc5fa1f85418bbeb

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