Malicious PDF — malware analysis report

Static analysis result for SHA-256 add09a2cd6b87163…

MALICIOUS

PDF

72.4 KB Created: 2021-09-30 13:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0c1dff86cb694a8276cdb174a8247482 SHA-1: 32098557d2cfe9396dbb4e74207924c97a1339c5 SHA-256: add09a2cd6b8716352158d45bc3ad4a417f6fcba50f2701c57e5ff2f37df5e74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised websites or malware hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further suggesting malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://wastran.ru/uplcv?utm_term=monsters+inc+gba PDF link annotation
    • https://sieuthimayphat.com/ckfinder/userfiles/files/73269056985.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/82268372994.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210923153057.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/1835718048.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/wavanifakivujax.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/dajenoguruwemezisonefiza.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/xinivumilebomovigonute.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/waxafezimosunegebiwaro.pdfIn PDF document text
    • http://meuseguro.top/fotosempresa/files/69957693507.pdfIn PDF document text
    • https://crawfordpoint-ca.seeninherd.com/files/5101149174.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/novamodonuxamanatiri.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/g036hdviffp7m3gp4k5ejg9l42/gazaluguxekabonovef.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/77814595641.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/20795458147.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/25740629428.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/zuxawevuwikubarefo.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/bijediweda.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/sufevubodebege.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615294ca63aac---27871884104.pdfIn PDF document text
    • http://lejuriste.ru/files/file/83809453529.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/54309461583.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/3569188914.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/lojovitobevodudepebob.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/vawusejaderazajarak.pdfIn PDF document text
    • https://baongochoa.com/upload/file/85845908349.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161498d1a49b68---lovejobizanegeb.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_off0000b5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D0 18184 bytes
SHA-256: eef6e6edec4dbbdce59bd197954c3f8fcd921ed8c22a62f2ce088cacb2189ca5
font_01_sfnt_off0000e3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF2 10492 bytes
SHA-256: aa93b52449e13a5043d561bf1c07257e8e6475fe1f64f637aa8d58c5332d6c27