Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d0337ffda445891…

MALICIOUS

PDF

90.9 KB Created: 2021-09-15 10:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0de2b110cbd42b45d22b14f2f43daa06 SHA-1: 89c8b467a68bf60a9dfb0490e3581ee4b1549386 SHA-256: 2d0337ffda44589105a9d35862569251f16dc2de05488cfca880b2748c7ee7b8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute a second-stage payload or redirect users to phishing sites. The embedded JavaScript is a common method for initiating such malicious chains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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://synerhu.ru/uplcv?utm_term=cara+cheat+cooking+fever PDF link annotation
    • http://abdon.madteam.net/ckfinder/userfiles/files/14516505640.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/83309351098.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/25725903304.pdfIn PDF document text
    • https://dhesient.com/media/xojakodosotisoguwe.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/jozirazudoxijivere.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/losoderoloxuwojad.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/bisiwaxigene.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/gokudumefex.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/72971846030.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/oj39i7q3nmqhq3nso2mf1us6ec/5071047695.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/80200783009.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/28267014094.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/57025504257.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/lotavuwomipotamebabebiki.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/lenipaloxujeginas.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413a0d29c22---71168317937.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/8830266774.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/solenob.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/42387149434.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae3dac717b---murewazeleku.pdfIn PDF document text
    • https://e-midas.ro/files/file/tekizi.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109020449238058.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/dibofefitujowitifosal.pdfIn PDF document text
    • http://coachhouse.info/assets/file/faladosunugirapisu.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AA 16280 bytes
SHA-256: 999e1da9b4e9ef1897fb4322bbaaa4d6e50000b67d86d889c2bfabd0d34f0efe
font_01_sfnt_off0000e9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D3 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off0000f1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000109e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E1 23380 bytes
SHA-256: b665aa565d4eafddbc701f1081cc77dcb8965d9334518aaebe3b68e2a508f461
font_04_sfnt_off000144f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F7 10592 bytes
SHA-256: 4d0b84226e2f45c3417b1f0ec145d947ca7d6127cca77c678f41dc09ecdc1bbc

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