Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d76657cab4879d…

MALICIOUS

PDF

84.8 KB Created: 2021-10-12 18:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b6bb32e75a8e6ea02a0fc08be3adab45 SHA-1: c4a3deef25ab6619ac9e907f6cbeba1972b948e3 SHA-256: e8d76657cab4879db41479ff2e1f540891397aa83702016284484cb191154de9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised WordPress upload storage, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common phishing or malware delivery tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://allytemp.ru/uplcv?utm_term=colombo+road+map+pdf PDF link annotation
    • http://julianina.de/upload/file/18980362041.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/74967225515.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161623e619d784---11510919282.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210922161511.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1616385b2b3f5f---97004291778.pdfIn PDF document text
    • http://fastbeatbattlerider.saint-fun.com/assets/upload/files/55934143115.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/54273537619.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b5977d312---62431635827.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152f35d6d0bf---nezuwoletufewoxilugi.pdfIn PDF document text
    • http://tlcjty.cn/userfiles/aa/file///59771926671.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/79j2oi7jlunpltpq11269j89h6/jatuferamaguguxadinuje.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/jusuj.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/43552757911.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/tiwawevaraxolalun.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/52926455181.pdfIn PDF document text
    • http://calisnt.com/uploads/files/fadejojanagiw.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/tanexim.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/8614246216.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/tisenovopet.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/lisumuzobuziz.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/jebatafabitegigafi.pdfIn PDF document text
    • https://kudusde.org/resimler/files/50618526637.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/45555793036.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/62724944016.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/biramo.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_off0000e468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE468 10236 bytes
SHA-256: 4380d752e1dd54793023ea6cb60723059d220e61168f8ac9dc5fc630cc22ccc2
font_01_sfnt_off0000fb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11330 20040 bytes
SHA-256: 147c7ce1f659f9529f53aee46829190708770e070c11bcdc31b96c1f951be942