Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed8d5239b75b8013…

MALICIOUS

PDF

88.0 KB Created: 2021-09-22 09:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0ebf2bd5ab173873a6ab193b9abf8b0f SHA-1: 3365ab7a58891fa6a0ca476c31756d10d69bc156 SHA-256: ed8d5239b75b8013e5ed3b389c001533be2fdf0120efa1dd9341f4f3dec528da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://chcial.ru/uplcv?utm_term=how+to+make+mod+menu+for+android+games PDF link annotation
    • http://matras-devison.ru/upload/file/sitefano.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/86919671119.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/86035991905.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/fororaranewef.pdfIn PDF document text
    • http://halaljones.com/uploads/files/rixobunuxevodalosizix.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/56196809182.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/60598954960.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/wuxam.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16134ff60871cf---35895076996.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161327d8d5d8dd---14752538375.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/e3ca11ca2de8dc1c09d70ba04061625d/31647726273.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/82346776641.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/sidide.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/c327d2dc6bdc97a86db407de13a69b11/6532066875.pdfIn PDF document text
    • http://capableapp.com/uploads/files/rogiwaku.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/26017168164.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/80702110012.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/bodudimu.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/91905518475.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16138aabb2d59d---xinefisovi.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613d860f1ff8b---migubufilawamuseroxigomob.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xizufekijitupur.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/6514551386.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/90838069409.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/11986956289.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109122145538376.pdfIn PDF document text
    • 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_off0000f58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA1 10920 bytes
SHA-256: ed28e389b8b30c12000e5cf93e53d95c969e26f221489d5bc1010639cc82ea7c
font_02_sfnt_off000126b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B5 16688 bytes
SHA-256: 6ba3dc9d5c115cad4dacb0eb9a63c0a08d1cb3ef4594a7c34560385fc94bad67

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