Malicious PDF — malware analysis report

Static analysis result for SHA-256 304f9ddddbb5aa1a…

MALICIOUS

PDF

80.8 KB Created: 2021-09-17 15:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 94280543c8c3fe350566c140dd9a988d SHA-1: 9c571b514df7753d39d5504bc9397aa4503275d0 SHA-256: 304f9ddddbb5aa1af770f644dfe5833292299e63743d501b4d5437eafa1adcc0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan delivery mechanism. The file's structure and numerous links suggest it functions as a link farm to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://gruppocreta.com/userfiles/files/woxidesalivemubonubale.pdf In PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/26327169992.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/fbd54e019737b3a938dc175b4740ca92/42147549351.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/62526285440.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2864e932e---71276334018.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/71801803128.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614312d4ecb88---fepalutokuw.pdfIn PDF document text
    • http://kammed.com/userfiles/file/sawasibazomos.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a67526e20---lajofavez.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/mesokizaxepokufotinoluji.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/4130860801.pdfIn PDF document text
    • http://15881588.com/ckupload/files/zibex.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210906091616.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/pagakisojigan.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/safopurebiwijoge.pdfIn PDF document text
    • http://arucax.am/user_images/file/25434251551.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/11025680624.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/11089736746.pdfIn PDF document text
    • http://airzo.net/userData/board/file/17124981354.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16143becd29429---95510871151.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/83883120945.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161313843b62c4---24059903301.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/fulimenilirimotufut.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/pozoja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=pubg+1.4+90fpsPDF 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_off0000d6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FA 10408 bytes
SHA-256: ca6fa63000583ccf80c6f2ce9e7278c995d8ae14597dab9b79f7dca764f36338
font_01_sfnt_off0000ee7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001068e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068E 18344 bytes
SHA-256: b7651373c0569bfdc0b390961102bcc3a561a5ea43da8cac218c13d9ff58fa80