Malicious PDF — malware analysis report

Static analysis result for SHA-256 df70773ec6501adb…

MALICIOUS

PDF

81.2 KB Created: 2021-09-04 06:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9d1c6f278e22f97e86fc2233239ab76a SHA-1: c4a2f0f7c7c00982f1d50ef62789ae12575436c1 SHA-256: df70773ec6501adba4987ea30a53f844a4bb25ddbcb87b88ead0a714105c8a99
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The presence of embedded JavaScript and a critical ClamAV detection (Pdf.Phishing.Trojan-d2568dad23a94d95) strongly indicates malicious intent, likely for phishing or distributing further malware. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://irlanc.ru/uplcv?utm_term=capacidad+de+emulsificacion+de+la+carne+pdf PDF link annotation
    • https://hankilfood.com/upfile/files/resulemorefe.pdfIn PDF document text
    • http://effekt-film.de/files/file/vitomuxor.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a2eb31eb92b---gesuvelimon.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161156181f205f---58390732183.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/64457917108.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/5v83n1n2ubo9p44jqep2ks2u60/posisusafenoto.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/4518f78eb17c767bcecf6d7f60a98d59/zijem.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/xewisiwolebisuvar.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/29140072297.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/64485107609.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210816_2DBC419111DC6902.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/pojew.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/zogegi.pdfIn PDF document text
    • https://vientangluc.com/upload/files/tudokenukukeweruwibivo.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16117900da32e6---lelibogudokevakag.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/51819951123.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/f7b1319911a781813870c355116fa409/dananuzezotevinizo.pdfIn PDF document text
    • https://jslt.site/js/ckfinder/userfiles/files/64146437866.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/nexaseleve.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/45069098669.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/xekutopawilisipuwetep.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/nuwuzinaxalorogu.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/78228738378.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/winufivevipufojagufotix.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/zogaxolomagamiser.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/52381790269.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_off0000d87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87D 16984 bytes
SHA-256: e16320b3e8ed8722500e4e75b322beaaf65d729f8f4caec6440340224ab08564
font_01_sfnt_off000103b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCD 10812 bytes
SHA-256: 759d004829b8abb37ed0c78ddd1fa717e45f75b9863bdc9f748b6121e0880a93