Malicious PDF — malware analysis report

Static analysis result for SHA-256 76268dd531cabad2…

MALICIOUS

PDF

75.3 KB Created: 2021-09-13 20:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3ee7d0715b0dc328d70befdf54c3c86f SHA-1: deb3b2476edaa973bba807f4432a5838b1f71df9 SHA-256: 76268dd531cabad28709269c484561a5edebee2fc4160325d6fc0c134eb7a03e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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://mimpishio.com/contents/files/88380673505.pdf In PDF document text
    • http://preiss.at/upload_files/files/zevexemudikipuv.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/27031554950.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/ruwupujisavufenezaxivaz.pdfIn PDF document text
    • https://akconta.com/uploads/files/togutetofimutalulomifi.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/20491498882.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/77676806126.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/84199770377.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/jarebigewefoka.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/sedotasarirefovabodegip.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/zevawu.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/waxologupapepupu.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109021825058642.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/govagunumefudafuki.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/73152047442.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/86293218570.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/5130935942.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/34233021123.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/rovuwixularex.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16138efe8142d3---53820242124.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/gononip.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec0bf0b7b1---89171194975.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202196183517170.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/87378577249.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16132743a944b3---68919100079.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=v5+live+apkPDF 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_off0000c461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC461 9916 bytes
SHA-256: f6da9dba3d6b8e869992b0ea5c1c3a7d6ee9e0783c084924addc87ff897831d6
font_01_sfnt_off0000da61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF273 17720 bytes
SHA-256: acc5691b84c2f141c2735c1efe851a36c9d05d5aa6fa1f99bd778451b4cf3262

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