Malicious PDF — malware analysis report

Static analysis result for SHA-256 964072530d975d11…

MALICIOUS

PDF

86.8 KB Created: 2021-06-26 02:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: df13e63bef62f4c55daaddc29644a7e1 SHA-1: c8e20c08f60a6fc7b404cbf44599eafd26c515dc SHA-256: 964072530d975d11a99f0e92a3e26b3654ba19dee917de7659d12774346d6731
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the 'link farm' heuristics suggest a mechanism for redirecting users to malicious sites, potentially leveraging embedded JavaScript within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=how+to+convert+mdi+to+pdf PDF link annotation
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f79746042552282e81a4634e8c1e22ed/5281255832.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/bujowedexezibosexodu.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/62486350895.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3b14ee409---fuvejozagerijamonul.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/wifipeseruji.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ca5fff83a59---78070354049.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/kevosizafitulipajabitu.pdfIn PDF document text
    • http://metallpress.ru/files/57000442606.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/561b9cd60ed23b9b5b3beca4206d04e1/4683305216.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/14278104909.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210527_743AD550B3E56F81.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/zuwigi.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/lufojodigegasulimedu.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/55dd63e339f324a9b3cb33db4080caa7/jixabavipiladirazabigi.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/235e6b75c4d86b02fc33015c58f7e5db/pulenisoli.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c2a15df3b629f79bac44fabc0ddd68ae/26342085543.pdfIn PDF document text
    • https://bnovum.hu/downloads/nuvexitivup.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/84176086493.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ceac7ec7a9---zeliforolofeximoxazu.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/2ac0c51346bdee70ee7759d271e30beb/98809636619.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606d676872bdd---nanutaxojaduzoxar.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/51708091280.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/c3bada0a0e6e6ea6080086893ca56b13/genawatodowilukutema.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ba56737e1a9---66439469185.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/xasunifuwaxalesejixusu.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0356f3c1b---bopixonikonanedevifisow.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000effa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 10548 bytes
SHA-256: 717d3a5b05e519cdf53487cb4cd1799a2a7f2ae29237bcef8e294e1ab21b8c2e
font_01_sfnt_off000107f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F5 17760 bytes
SHA-256: 62497061c4e1dcba7fc51c8888207eaceabff81d3ab79942e4d61a8f7f94a1b9
font_02_sfnt_off000135f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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