Malicious PDF — malware analysis report

Static analysis result for SHA-256 b869856013976af0…

MALICIOUS

PDF

69.8 KB Created: 2021-10-03 03:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e8a43da2ef20021df02a7675d77323a8 SHA-1: 585396c5fb9cd675a6deb510f6977ad9b4b56385 SHA-256: b869856013976af08078bfc80a51e8c295ed02641495e95b7d39630b12b2dcf6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to T1059.007, and the overall nature of the document suggests it was delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • 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.
  • 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 https://cructi.ru/uplcv?utm_term=carbon+and+compounds+class+10+notes+pdf PDF link annotation
    • http://fujavietnam.com/images/Download/jijilagojufugatinoso.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/40181730131.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/10619428238.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16158eeec5b54e---45469432528.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/29589164390.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/77657691767.pdfIn PDF document text
    • http://holzbau-napetschnig.at/wugepegotuwesorexa.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/wisabijidova.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/xumakurifujolipuxinesip.pdfIn PDF document text
    • https://eliteprotectiveservices.net/ckfinder/userfiles/files/16262096429.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/27333297660.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/20932530311.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/gimamuzagot.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/tiloz.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/76e97666386512913a4f98e95ba82050/74570529887.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/28875f05a8db69b2810073371ef1ffce/zukakuwajamikenimuw.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/51495799271.pdfIn PDF document text
    • http://taborgospelassembly.com/userfiles/file/42461090002.pdfIn PDF document text
    • http://tai-group.com/upload/files/zerivewidapawigafi.pdfIn PDF document text
    • http://ipceurope.be/assets/file/76858341026.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/buvorogesogo.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/minaxopenovesodumum.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/26692130773.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613331f75ee4a---23879567531.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/29000856587.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16143778157f4f---wadojadesozi.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_off0000b322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB322 14684 bytes
SHA-256: 8b87225b1983ae38b01d5c9d46d86ae564c78e11700aeee6ea191ab4099a9fd0
font_01_sfnt_off0000d778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD778 11136 bytes
SHA-256: d6ea710a9a140a01d2c302009c564a3aa5bef5184c2412942775968041095256
font_02_sfnt_off0000f152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF152 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1