Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b7599e0c7464d4…

MALICIOUS

PDF

82.3 KB Created: 2021-09-07 06:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c82ad91100c32a77a41de324b298e65b SHA-1: caac132c8202a0ab24602dc5e1bfe9a40809f54e SHA-256: 78b7599e0c7464d44308a93e8de478ae0d8eea25f7f3479288c8edd8d06e9569
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was identified as malicious by a ML classifier and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://sonhanint.com/uploadpic/sun/files/202109040053013145.pdf In PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160780c4566fc5---41302639281.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/ci4tp8lc8e06tp02i5m370crev/tumidadisulo.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ed76857f819ca73b9bb9f44917eab369/sapukesasamejigoxe.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/79901948163.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/roxowugatalirudegajopusiv.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/wejawozatazamoti.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/tovufinikapevizebepoxezef.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099214c09151---texonefatigakovefuzajaro.pdfIn PDF document text
    • https://ebooksweb.net/files/file/73430027417.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb54e38cb3---tigijoxedarogek.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/vfmi33c5fstagpm6dcua0snmd1/27873464885.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/3crq2p2jsku1hgqdph6k9vaped/kidisiradu.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/34480449996.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/giwufadaw.pdfIn PDF document text
    • https://aashianarealty.com/file/pofixejupemurukuw.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/97f11e9917a2b4c7569770015f558f62/gorugeninoselurutizok.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vj7i17liu6lpsftqq5k5n0h5d0/zunilomoronemoru.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf82f5296f0---tulemabinugukawimudopelu.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/59551353166.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160823b2b9f82d---jomosulat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=adjective+clauses+exercises+worksheetPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3bf2f194f1---wirulakuwuli.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_off0000dd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD84 17344 bytes
SHA-256: 30883fedd3377f58dec63f48ffa9494c11033c83f9c59b010d90b746ed740f50
font_01_sfnt_off000109fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FB 10920 bytes
SHA-256: bf4c8ca36138d8be5fcc90a98b0cf933c26eab385352a7dd2de857759fa2bd8f
font_02_sfnt_off00012379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12379 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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