Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf63eba9574b8479…

MALICIOUS

PDF

220.6 KB Created: 2021-08-11 11:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6e8cea887a524b1c089d7f02ffffbc7f SHA-1: a81621fb5a6da90292a6be83b672a241273881b7 SHA-256: bf63eba9574b8479ef98954000ca6a5d6cc0ff175f0adb92f3f7adca66f15d15
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely leveraging embedded JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 5

  • 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.
  • 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://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921fbfe6ec3---regakexutadeto.pdf In PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/al2pp8jqhu2tii29uvhfa6c4sh/67722782708.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/57987483322.pdfIn PDF document text
    • https://emprenderem.cl/files/wipixomogupem.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/xudowojatoxodasiwi.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/28310b4dd6f3e487587ec4204150eaa6/6731357480.pdfIn PDF document text
    • http://auldskoolrocks.com/clients/878384/File/73839864784.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/82011966612.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/74920833864.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/94294257185.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d47b22edd7---21008465427.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/80262717690.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d6560b40616---wilirobepufajijizuvinuf.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/97689192862.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f316164348---xomagulinoredawigagut.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/43244715085.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/29870218266.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/f7f807779022d1a251f760ec727bc1bc/50040756419.pdfIn PDF document text
    • http://afslab.asia/upload/files/48027523267.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/871c8ba3cfe4293edc0cd2e3ccc0949b/59831795960.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/6odpume0ocj7g6elkbtt0h1aaa/4753834249.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=what+does+god+say+about+mothers+and+daughtersPDF 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_off0002f881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F881 22240 bytes
SHA-256: 70193fd6152b69ac455e49556ecf9efba386614394884bc62f73951dfd885cec
font_01_sfnt_off00033107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33107 10904 bytes
SHA-256: 9c2ab4b1eb362cbaf11666aec863357c1eda5cb2d921285e06d76a8adcb3258f
font_02_sfnt_off000349e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x349E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1