Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ffaa36f560b4890…

MALICIOUS

PDF

77.9 KB Created: 2021-09-05 05:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 737cdd4801dc06e3d2d302f36fe6e6df SHA-1: cb7491d20c12ca0d5498c3a4e8aa83092b7fe830 SHA-256: 4ffaa36f560b4890b202ade03e725573ca05cf455a6e83b660d6db48cf93c1cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The embedded JavaScript stream and numerous external links, many pointing to compromised WordPress sites, suggest an attempt to redirect the user to malicious content. The primary attack vector appears to be delivering a malicious payload via a link farm hosted on compromised web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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 https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/3cptl548bequo9sqbb4abd7cr2/laseturonozuguxutezizako.pdf In PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c477ff7d716---31214495240.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b71bcd3e4d6---nudekuduxexikawapibol.pdfIn PDF document text
    • http://mobiliteit.nu/files/mubulupo.pdfIn PDF document text
    • http://zae.me/datafiles/file/96417334021.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/mimekusirazetozajoxamit.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090e5949033d---34832855940.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/1hobngv556qjtmtctunjaut30a/wodumo.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607be7327ba6b---kefovexamogunomu.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/32565406299.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4ff2c1457505c82dbd2881aa65ba88ab/27217095012.pdfIn PDF document text
    • http://poiskvod.ru/images/file/kuzusetar.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4f93074f4---43629577456.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/94369971568.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/fixetumisisokumego.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/77103692618.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5e90930a6---29003766810.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082aed6c467d---30589632693.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/10252f8632a1ddf780dceee59879e9fe/nonanimomosox.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608285fb21c06---wisesexejeporuten.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/86388690278.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/levepanumowizumulujor.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/danujilelagolodovinikunat.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/28281333253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=bandhkam+kamgar+yojana+form+pdfPDF 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_off0000c557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC557 10800 bytes
SHA-256: 063f143797008bb4c7ad3e370822b0f1350d7b562a4a893a1935c82c9f4a9b0e
font_01_sfnt_off0000ddc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DA 19824 bytes
SHA-256: 353d5db192862f2dd98ca782796a317b0e9a8bd3d3c06d63a5bd85e5cb62002e

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