Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f23a4002c324c9…

MALICIOUS

PDF

85.2 KB Created: 2021-09-23 09:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d7baddde21e24d11dac582f1be188d25 SHA-1: af45d8d356400a235bd3e2e585f88725f793e900 SHA-256: d1f23a4002c324c933433506d39037611b10b94fd9dce37f130f72e0c66d5a17
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/92572895994.pdf In PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/dcd7b94714e68a1c084e6a1161e22cc6/23289736928.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/84221253627.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/kugulafiwalujudalotagumu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ot5kscqbld025dp5gcqhr5tmk2/leruwejovuwag.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/kuxoworetavogusedupime.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/zafogam.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbdcfd8325---dekaw.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/bapuxunijimeve.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/famebazoletisi.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/230315363922.pdfIn PDF document text
    • https://matricula.arendic.cl/files/bimetasaxiwebesukek.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/risuxojijegodofa.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/banozaperologas.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/gubexemiwikajitosu.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/80012054442.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/28900365422.pdfIn PDF document text
    • https://toocapen.com/files/46937933473.pdfIn PDF document text
    • https://phm.vn/upload/files/31338137671.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/81aa1ed9179a85a65853153eac103df7/dudiw.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac86ca75e7---61209101229.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/fejevibutomikemopazu.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/xaselonefivovejir.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/18074273905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=terraria+android+cloud+savePDF 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_off0000e5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E6 10392 bytes
SHA-256: c5a6f6d3a2d4c7e3b2cc2f2f598402ee3e3cc22311c778a55c1ea07f80df47dd
font_01_sfnt_off0000fd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7F 19136 bytes
SHA-256: 6b3bd59a6533363d8376806d0cf2ecd17fa0a24b3bd40fac516e9937c5162a52
font_02_sfnt_off00012f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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