Malicious PDF — malware analysis report

Static analysis result for SHA-256 d328ab2ec1c97517…

MALICIOUS

PDF

91.4 KB Created: 2021-07-05 06:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ae8247bf0123cadfcce3ae6011e4e162 SHA-1: cf1cf38b5dc9c1fe690b2545ada7bb18f3edc3c7 SHA-256: d328ab2ec1c97517767dc0f09cfae0b2775d693529b4167a2b3484a5ae9a14fe
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. This behavior is indicative of a phishing or malware distribution campaign, aiming to lure victims to malicious content. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://ivanda-commerce.hr/userfiles/file/32651717933.pdf In PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/4k027bo4l8a3korltl1ieofroj/femenomozumumex.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/dnrokshufr1n880eileabjpmcu/mawudaniwasukunedobitos.pdfIn PDF document text
    • http://keacg.com/upload/files/3177201866.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/lapawonejig.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/63472953631.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/nekaruzilusikurebilav.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/042f7e2b830a6c73b8301d4735868f29/39330213636.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/51312490573.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/8k6lgg0sucnm1n7gk3pat0nhjh/63639468181.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f646733a6a---69177116271.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f460bd3d33---xopobapupuzowuvox.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/31690167566.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/edf999cfc1ae0ac18706c94f93378b41/64229680532.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7f31df3bf---lenibadikevesowelanizi.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b464e0f6eb---wozadetaripur.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/sapabutavetufupanex.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0b4dbf317---nalikiwejukofabopej.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/37743d3d5e71494346df0a5f9cfe9aba/bowebulevelafifewulifalo.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160934996984b3---komokodogepofewadabizelu.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/37550378980.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608269338e446---13536365199.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098170c560b3---xarimanikojibilamid.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160984f6343d17---pinogivilepegugenivijajim.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/96430949477.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/1452851530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=why+saving+endangered+species+is+importantPDF 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_off000101f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F4 17044 bytes
SHA-256: 82d6cd3f5263d037eeafa69e6fef197d751c8619ead1da16aac0f26ca8344a1e
font_01_sfnt_off00012e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E44 11088 bytes
SHA-256: 42c7b83f1464a66cada538cc47e687b8ec1b601009b5d08d2ed0239726f89c64
font_02_sfnt_off000147cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1