Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4dbbf335dba737…

MALICIOUS

PDF

79.6 KB Created: 2021-09-06 02:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 120e61144ea7798f327e812e24f31f62 SHA-1: 71de74f35dc4f3ac67e96ef73fc2aef6c44b6329 SHA-256: 1b4dbbf335dba737b31bb6eeba0810ca0bd182b7a0bf465ee3fc9677a61374d6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable domains or WordPress upload storage. The embedded URLs, such as http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad214dd169e---bilafun.pdf, are likely used to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb689843ba---jomumigebopazepimutumigag.pdf In PDF document text
    • http://jnnycc.org/userfiles/file/413346666.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/suwiparexijidupejejaga.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/37954619000.pdfIn PDF document text
    • http://vejwun.cz/images/tudodazudivelogopumu.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/09aea5419247e37fe1ef3df8c36b79ee/40424103049.pdfIn PDF document text
    • http://acelybio.com/upload/files/piritazesigetafoxuwim.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/35345337851.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad214dd169e---bilafun.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/9f770a7ca1f999f50c7705048b5f0303/tedotugofigikedufopu.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/767ffef1083f84966b0dcfdda03ad2da/pikanufokupuneritox.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bffa90eef93---famuzamukevaxitafitinemus.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/xolofexaberaxozawuwujexo.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/luvivav.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/rarazapatibivumuwa.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/gadipezovuxit.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9fb1aa0cd---veselenogutitosaza.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b789b77f2f---76577014873.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709d1e5347c---merafarin.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/47244588923.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/fsk76fpo96el6l41q43r4ti9u0/80623779707.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/63436950555.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/bukanavogimux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=pdf+reader+for+android+kitkatPDF 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_off0000d631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD631 16824 bytes
SHA-256: 716e424a453be45c03ae61384e22f1a2946c6fcd7c6e442c435b61315423d83b
font_01_sfnt_off000101f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F5 10224 bytes
SHA-256: f015f4d83d24528d7dea3eea5a3023027b08d5b6819ef7c0ce47cb6c590f2076
font_02_sfnt_off00011908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11908 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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