Malicious PDF — malware analysis report

Static analysis result for SHA-256 11f790d93f230e28…

MALICIOUS

PDF

68.4 KB Created: 2021-09-09 17:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 31c3ca9410f020069da9e7938fa686a8 SHA-1: 18b3530337f9bc8818476e9373a11f728a44bf54 SHA-256: 11f790d93f230e28e686556de0ec5028882659e0a69725f2bc43e7ff44551c05
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The file's structure and URL patterns suggest it's designed to lure users into clicking links that lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://reklama-v-sochi.com/ckfinder/userfiles/files/94062826815.pdf In PDF document text
    • http://pekingtogo.com/uploads/files/bogamomojefupijuru.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/44969481961.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/32414859837.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138b7cf57edb---nitiw.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/24835661155.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/dalevizuroboxuvujikosed.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/1478147861.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/vexipinu.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373f2eb31e8---88840023596.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/66998079046.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/50482512737.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/20584006843.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161394b6486a3d---6646619555.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/45857189880.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/69437260244.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/11699143076.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/faei6f7llupumdnke2fo36dhv0/tidarajidawe.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/23558754547.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/47g0e3hvb9vq364lf9uii7dguc/difudebovewobozixozuto.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/53393572469.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/35467947427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=handmaids+tale+storylinePDF 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_off0000ae90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A2 15088 bytes
SHA-256: c0dea51adcc77ba5a63f7cb0445a58dc6436dc31c96804fa1f9b2b5ef7c47a1a
font_02_sfnt_off0000ec90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC90 10512 bytes
SHA-256: 7b63142f190740272e77cb116c47a93430ace7f347865bafeed049f28b5c8a17