Malicious PDF — malware analysis report

Static analysis result for SHA-256 727b3e0183bcc06e…

MALICIOUS

PDF

78.2 KB Created: 2021-07-30 08:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: bb47b2a31402e0b233ae60513ca2be05 SHA-1: 9a963bd6188df1c08b2c433728871ec9f381efed SHA-256: 727b3e0183bcc06ee4adeabf55e2a3703f18bef3406f8772526eec8db308f688
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/0a316d3adbed862a895c6c32d01c187e/36915995754.pdf In PDF document text
    • http://annabarons.lv/files/files/82028026276.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15369db30a---goxolinaf.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/67279914948.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/muriwumebodijoxokijepof.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bf5a05af5---wolijuxagabilarijaza.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/33612910795.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160904e1088a99---97777478538.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/t905nd7176nd8jr1pjlt6h2dg2/masekibukisavutufelor.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/b93890045668bb7b8d16ef49c08261ae/21011627742.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097fd553c86e---pujudopixakapoti.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/budefizom.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/e1c3cbbbb8ccc5839d2e0fee3be57db3/tinaparuriwum.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822d997f043---tufevokopi.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/mesotovi.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087973ae0349---23513144587.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f6785ec82---dinirotubatofuvi.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607956f72ca3d---zopadoleruduniverod.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cd4fc0e82---38312566119.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b346fc6153f---xonebufopevugidufifatisa.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/81426952642.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/10584378582.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/73206485846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=crazy+pixel+apocalypse+unblocked+76PDF 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_off0000cdd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD7 16256 bytes
SHA-256: 517024d965442d7491658d47b3cc82e8c2335a0554c2ae44021b23d4a171f8b7
font_01_sfnt_off0000f81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81D 11268 bytes
SHA-256: 2c533563522b0315088191cf8ca8f2c6cf0319411bfb904edda7c31f9c4b3f96
font_02_sfnt_off0001128d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1