Malicious PDF — malware analysis report

Static analysis result for SHA-256 953c64a86e539f18…

MALICIOUS

PDF

81.2 KB Created: 2021-09-15 11:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5dc8dfc1cc781cb6dce048b4bffff9cb SHA-1: 59a3cb1a70fd1c4a1b37e4975c329b6517100d9e SHA-256: 953c64a86e539f188c05b50940be353aa9b2103d76364ec88222c57469b0530b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for Pdf.Phishing.Trojan. The file contains numerous embedded URLs that point to compromised WordPress upload storage and other disposable hosting sites, suggesting it functions as a link farm. The presence of these links indicates an attempt to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://coretry.ru/uplcv?utm_term=tamanho+icone+android PDF link annotation
    • http://bjerkelunden.org/content/files/userfiles/file///mokozodek.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/gopurobopeligajesufelevu.pdfIn PDF document text
    • http://hainfelderteich.at/zekar.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614156254d4e6---63754373874.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/nogopolimusibutakumesoxo.pdfIn PDF document text
    • http://suaups.net/userfiles/file/6886486475.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/35148069362.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/27652702220.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/fajuzedexadukujakederex.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/5m82lo1qmgm9clvmen2s871610/46730861695.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/wuzug.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109032049079316.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613836f4f0849---xomoja.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/93714339749.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109120615108975.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/malikebemegukamu.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/58287988547.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/xofimosimimisu.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/e10460ecc12f31b8ab6ba46daae396f5/21292869880.pdfIn PDF document text
    • http://devveb.net/userfiles/file/38558000371.pdfIn PDF document text
    • http://methese.com/upload/files/87890115199.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614037332486d---fuxelolelilaxip.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/6e5996668a2b602b6deb367edf566cb9/rokomevuxogilin.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/71982166014.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/43368543532.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210903_9EED9013612B79F1.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_off0000dabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABD 18356 bytes
SHA-256: d49fff0c6b7dd79731f5e2e58fdbaf1628b0c1c5ad68cbfd0771777e21246034
font_01_sfnt_off000107fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FA 10284 bytes
SHA-256: 34528bf16e029c16a20c62af1f1c4255668b42dc7302c19acb6c604a43e1cfde
font_02_sfnt_off00011ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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