Malicious PDF — malware analysis report

Static analysis result for SHA-256 5730f68809dbe88c…

MALICIOUS

PDF

88.1 KB Created: 2021-09-07 17:35:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9ee5b9677622508af104c7058bebd6a1 SHA-1: 2ea0efeb8fb35e9d5f5d80c0b494de748119b596 SHA-256: 5730f68809dbe88c0efffbaf04797536a21fcc0e4c2a99634f03f385b8726105
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it likely exploits a vulnerability or contains malicious content. The file functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious sites. The presence of multiple links on disposable hosting further supports a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c369065d---fuxawidikezuvu.pdf In PDF document text
    • https://netiko.ge/img/Data/file/60854418982.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/temegewewib.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/ninir.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/2275900789.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2578f3cd8---28868476400.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/85345860264.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fee003d730---4278618306.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/99386516973.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/80424136689.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/migofu.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/87228673168.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/7c1ac6ae0721f1c083bdfddec0c12431/87177341811.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/88728439311.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/47571389230.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab526c53a2d---rurufozubivuwa.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210507004429955.pdfIn PDF document text
    • http://maksimetall.ru/files/13041388700.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/39082153677.pdfIn PDF document text
    • http://ahchala.com/img/file/94828486688.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/73612247344.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/974824c8979cfc649c6a2c532baaff13/38878895994.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bfad6778a83---sifenunedavuxogavaseve.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/kefixizofexetilifiwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=gymnastic+bodies+foundation+one+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_off0000f2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABC 17728 bytes
SHA-256: b840acdc2a751a18340fd8e56f6ee35360f883895af875e27892bd71663bad7f
font_02_sfnt_off0001394b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1394B 11028 bytes
SHA-256: 0eb5a0d33bd14c6443c94c33925000dda11784ff3893345a5b6e34cfa2eb0541