Malicious PDF — malware analysis report

Static analysis result for SHA-256 78905e3abd4bb46d…

MALICIOUS

PDF

69.5 KB Created: 2021-09-20 14:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9348ca40da38535314a1c4edc0272716 SHA-1: 82f4bad06c141e100428d8aaf0062bc1ee117a14 SHA-256: 78905e3abd4bb46d6d72653f09ac7c78e5a9863cf828ded1c3cb3668e9719f82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm with numerous URLs hosted on disposable domains and compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://crysiq.ru/uplcv?utm_term=car+parking+2+mod+apk PDF link annotation
    • http://defhjdr.friend-match.com/upload/files/doridumo.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/71eece9b5afbd9f5d4d379084282593b/73904930701.pdfIn PDF document text
    • https://brakos.it/file/kusagoramog.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/midubixowoxizujojibiduse.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210908_101600.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/dadonagabe.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/27878495950.pdfIn PDF document text
    • https://noventa.cz/media/files/file/11565061864.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/51343518934.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/mefon.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/gojufamipadopefi.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/17918340640.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/bewakozibipalejimid.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109082045403374.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/bolujokobanejapulavodozut.pdfIn PDF document text
    • https://12shio4.com/contents/files/davunadapega.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140c18cea450---gaxofolexusin.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/50090541927.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/43932440343.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/14505323000.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/edb8dcc6b1d1ec97fd40037901186d40/falib.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/bodupab.pdfIn PDF document text
    • https://parkettworld.com/upload/files/mewazuzisovaposurev.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_off0000b1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A8 15480 bytes
SHA-256: 0153e94381d54bfb277b0c67c4c7d975dcc077c993ddbd82d636d8a38e969de2
font_01_sfnt_off0000d8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FF 10536 bytes
SHA-256: e5faf4b84f692db8b0a6aebb9198a35b8243c1b069b273e0aff3441cd8f427b9
font_02_sfnt_off0000f0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1