Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7df0146d5e43256…

MALICIOUS

PDF

84.6 KB Created: 2021-09-21 08:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 50ec488bd75b3dc995063c118b8d3fbe SHA-1: a18f10557d4fd617b6072683824deb72d6030bfe SHA-256: b7df0146d5e4325610304d516517fde6f7ce4509dce971026b2fe751d1ae7b3a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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=bloxburg+6k+house PDF link annotation
    • http://gzsjlt.cn/userfiles/file/lesukofemadipoxokuraleli.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/11507069672.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/92871121374.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/giverit.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210921_23E7C8C63F072D3A.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/sigapitunuvevutebosaweb.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/55015879871.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/9499ela053qavmhhhk873u1k89/66336381141.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/pejotasazawapelorevabupi.pdfIn PDF document text
    • http://dentistturkey.com/image/files/zopetusaxarimidite.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/cf1cd0645d8cdee31734b87c0dd0bb80/54523499331.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/jatuwadakupitisatu.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/62039669966.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/43593310418.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16149561e62267---87836745792.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/54376514432.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/kumunufekufuxonewegaxaxi.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/41190466784.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/migapiraduko.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/99315422325.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f79ba35538---nesukerisijajuzozujujufa.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/girenagokosurutezuruzivak.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vafezobupokina.pdfIn PDF document text
    • https://mattress-leader.com/media/lizovefidibexilepixiz.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_off0000e82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82D 10584 bytes
SHA-256: 7847f24bb1b1b751cd7404ca85bd7741adfa0dfe3a746a1e3782bacb0c350475
font_01_sfnt_off0001008a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008A 17368 bytes
SHA-256: 81c9eb863e6ea25ad8817c870a2bbaa9d456410c092f681c700803359225f777
font_02_sfnt_off00012d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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