Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b6bbb04c9a5eba6…

MALICIOUS

PDF

131.2 KB Created: 2021-07-14 03:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b0f283cba00f116526a84322d70da948 SHA-1: 10e332fe4fc6da09a2df896bad40443902fbd75b SHA-256: 9b6bbb04c9a5eba6da3bb940bd0c3a2daa0ded4a061a0868ec798493635f3737
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. No specific script actions were clearly discernible due to potential obfuscation, but the overall structure points to a malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9834

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nusratali.com/userfiles/files/kazenufedovaduruxukitafil.pdf In PDF document text
    • http://metabolit-plus.ru/files/file/92212381844.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/ziwutivanunitenalivamade.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/5049a3dai45a5o757mknv4c9n9/jurofawipuguvaxu.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074093dc5aa8---78851765610.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/natokufin.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080c4b1d9a3f---fikegizosej.pdfIn PDF document text
    • https://sabunwangi.com/contents//files/tetomabetige.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/89843214285.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/16948144518.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a06cc59d28---93387065445.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/87504680654.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/bumetinefopilunun.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/f22393cd05fa7ba10521521f985c77db/kakadagiseluve.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aff6be8906d---12454538556.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3e4e7ff45---bezibegagotobesapopuboba.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/158aabap03d86ejamck033o3fu/gidubigorigedetub.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/11005377813.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/nagogunatogeroforojoze.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080312391493---fepemafuxunelupipedove.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/5b753d36da585af24a2987352cf12995/dumeno.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/detibipobepalo.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/wemujosolaziviluwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=symbols+used+in+civil+engineering+drawing+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000183ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183BA 16320 bytes
SHA-256: 9d38e1d9265b41fac95feecb1dbd222f7cd02244219ce4819cc90a7dae31b71d
font_01_sfnt_off00019a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A05 11448 bytes
SHA-256: cc72165c6980e19f9d842b27a27d2be2a459cd6596eba749568422f2264c7765
font_02_sfnt_off0001b4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4A5 18904 bytes
SHA-256: 62e119aee85e9f3c3e3a27339679fdfe2fb80b0203b175e5dbcabc8e6735cfe7
font_03_sfnt_off0001e6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E6A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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