Malicious PDF — malware analysis report

Static analysis result for SHA-256 1462991d74d87fa2…

MALICIOUS

PDF

108.8 KB Created: 2021-07-01 20:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e3b12c15a13da7d6b39c1985bcb8ffec SHA-1: 49a5d521d1ffcffcbc2a0759de1fe34a4305b992 SHA-256: 1462991d74d87fa27ab0b7ffc15d8c946d9e4e41370ea8f4d0a15e0c5a59fed4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures and the distribution of second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pestresolution.pt/site/upload/file/95589641677.pdf In PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab580f58df9---72390723054.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608730afbcbb2.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/34af068d55a2d72c09a7e6a18ba0db6f/jigirakarimojopitubezane.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f71506ca8---40897000486.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc06a526546---bupemed.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/d7ef23c484b9da97852972a2885536d6/37701790262.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/sirabufapuworalafe.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/9ba2fcinrabkk4lj4viemt22k0/megaxajadisubasenawafezu.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/71029663791.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/xiwejewidalobobomusakijo.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/be38bb22a1403d9045c552a04f7bc236/19219814237.pdfIn PDF document text
    • http://jinohair.com/upload/files/bivijakurobarupuzokad.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/93bokgian9bku1dc6oktbbjspn/13381973298.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083affd34491---90326684647.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8b136d3cd---jivolivasap.pdfIn PDF document text
    • http://apsons.eu/files/file/jopepaxunefiso.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/69033962820.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/92962544026.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fde40b465---33212735876.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608124189425c---4244104229.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/9764eb25381cf85481c1c415c07519f9/kosaleledosunaruv.pdfIn PDF document text
    • http://nashcentralfalcon.com/clients/d/d5/d5bea9c86035def548a020f7371d19fe/File/nobujig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=old+name+of+surinamePDF 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_off00014531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14531 10540 bytes
SHA-256: dbb119ff32c5df3c5f6624ebe68a833a85d33c9326e2c4ccdc8c117a85333ebd
font_01_sfnt_off00015d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D1E 19068 bytes
SHA-256: fdc6159bcef4576b2947fe0528fb2deb53b6b64337a353bea26a7e5a06a3616b
font_02_sfnt_off00018e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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