Malicious PDF — malware analysis report

Static analysis result for SHA-256 3247d56fa17fc107…

MALICIOUS

PDF

72.2 KB Created: 2021-10-02 15:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 96ba7e823a0a0f8e06d770640ff81c97 SHA-1: ef581d51053dd81d4f720442d04607775920f772 SHA-256: 3247d56fa17fc107413dc0afd66f2fcd5cb5ea8dbc90987ff422dd8427fac737
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://santehnika34.ru/images/file/jawixojojuxaropoxala.pdf In PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/dazopabaz.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/52660570563.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/83819547327.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/zipafeb.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/tuzomopejulatofox.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cbdc7e6168---18545173839.pdfIn PDF document text
    • http://machin.kr/userData/board/file/93142753711.pdfIn PDF document text
    • https://sin-wa.tw/app/webroot/userfiles/files/kobusutewuwede.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161539ca4edc95---24971419341.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/vurulutefofiwesolir.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/82518330857.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/xaxemapopib.pdfIn PDF document text
    • https://vestol.bg/files/file/31780825504.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f5f3c0cf4---juvekijagugopiwopar.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/razatemo.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/96672438398.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5ab579f33---xoxoze.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/74408662372.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/legalatumoraneworij.pdfIn PDF document text
    • http://rcot.by/pics/files/neretiganus.pdfIn PDF document text
    • http://anindecor.pl/files/file/62744932796.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/87528663323.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/78040757732.pdfIn PDF document text
    • https://grnca.org/img/files/files/tebagu.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/9448012969.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=skills+needed+for+business+career+sims+4PDF 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_off0000b5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5FB 11024 bytes
SHA-256: 6fcc563b8d00320a075b485dd274ac5979251ea85bdf4b7528a1aefc5bfc4ee5
font_01_sfnt_off0000cf8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8D 16876 bytes
SHA-256: 999a1f42b677f50144860dfce377a30bc9c35f1b8464b34c40be1bd196b3e071
font_02_sfnt_off0000faba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1