Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eaa8906b445a3db…

MALICIOUS

PDF

87.8 KB Created: 2021-08-30 10:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: edd2c66af25735c8bbb7144da92763a5 SHA-1: 2fd333944497377a9d28482db3eaf32b46fda211 SHA-256: 5eaa8906b445a3db02d45129fe3297a6550f9e9f00f6dccb642de8be84333ce3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URIs are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://smidgel.ru/uplcv?utm_term=brother+innovis+40+manual PDF link annotation
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f263140564---4857980231.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/56991028336.pdfIn PDF document text
    • http://tfforming.ru/d/files/ridegoseriju.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/zumazijebitajibuji.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae81ca1f857---11065568479.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9adaaa98a9---1076479583.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161194768eb4c3---kisepiwimubidajezenaves.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849476c2cd2---batigu.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/birepelazipupedawexado.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/14236223110.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/97274819343.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bf4e1cfa6---91081202949.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site//site/data/files/30170885686.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16079fc412c5fc---45080571135.pdfIn PDF document text
    • https://mar3ol.com/Files/files/debimatusejalun.pdfIn PDF document text
    • http://accronline.com/userfiles/file/82089234202.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b77fbfcc003---60161808630.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/wazuwemivimu.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/a0b87bb826ae049bc775d7702153b228/12268201951.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/ripenosexobamuguguvidij.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/nunige.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/adfdd535eb6fc9ef57f65d38ac8b6060/73807780536.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_off0000f2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D4 10792 bytes
SHA-256: fffcdbc5eb18adf1fdacaeed618788c3e8a177aaed50fae01de6f959b6a63de9
font_01_sfnt_off00010b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B99 17412 bytes
SHA-256: 402e9831e17491e81dca8d7f665753813066a9e1cb8881f735994db271268525
font_02_sfnt_off000138f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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