Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8606ad1b99a1475…

MALICIOUS

PDF

83.6 KB Created: 2021-09-17 22:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 85dffa7e0e728de0f009e3cc553f9a88 SHA-1: f47b53056a64a483995f374c8ff14816b07d0be3 SHA-256: b8606ad1b99a147584e12bbfd4e5a807ed68214be4b120c9f9a70cbc1fa014b5
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://artiguardia.pl/userfiles/file/18537519782.pdf In PDF document text
    • http://mutamobilya.com/images_upload/files/savukenovoxamekegituva.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/65687876388.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/zuvizebuwimowizuti.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/2416900835.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/mubumoviwiluza.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/litizutel.pdfIn PDF document text
    • http://msiutilities.biz/documents/tasapatimaromujiwakaki.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/10443615011.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c64e7378fd5f04d9079482c3e7b59810/kefurogirid.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/dewuk.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ab4869728---30106597583.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/30131694188.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/66395062194.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/ed0c8947696740ab9fe37fd3d5cfd6f3/vobibofazot.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/vezewewegevuridawujopafu.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/15450623502.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16138df8842739---60733576245.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc6f8681cc---mulumemejibasogoxufanavil.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/55199540546.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/bunokekikegidabupagilorar.pdfIn PDF document text
    • https://podimercrm.com/img/files/71406911018.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/zawakafeguromumo.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b5fdcf6a9---mifunakaxotivibiz.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/kanipajisifadirugu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=inshot+video+editor+free+downloadPDF 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_off0000e18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18B 10552 bytes
SHA-256: 5c8cdd462adcc7e31b0416d3859f87eea71e233fd4961e248b73f14832f15355
font_01_sfnt_off0000f994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF994 18320 bytes
SHA-256: 50b03be02a4617922955cd47bdd07416356ac724b7b0c80297108f278637f15e
font_02_sfnt_off000128eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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