Malicious PDF — malware analysis report

Static analysis result for SHA-256 8561417fbf689751…

MALICIOUS

PDF

83.1 KB Created: 2021-09-19 22:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 49ff52880c4aec76af6b2dc118d051a5 SHA-1: 0dc0d25984d6fae6f9cb5fe051218e6a8f67c122 SHA-256: 8561417fbf68975169d038e768aa2517bea7ea16b00b36fe9bd053006aa64f78
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with high confidence. It contains embedded JavaScript and numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of JavaScript indicates an attempt to execute code within the PDF, likely to facilitate further malicious activity such as downloading additional payloads or redirecting to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://coretry.ru/uplcv?utm_term=dls+2020+mod+apk+obb+download PDF link annotation
    • https://al-farh-iq.com/upload/userfiles/file/99033757528.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/7848124981.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210903174248.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/tixunosu.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613b746060349---79223342307.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d65dc5e36---50488247835.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5de78d8bf---wifipimixokonenodekad.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/vuxasori.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/tegabigiromaxumilimibuji.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/nimemiputaxizise.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/tixisiwimogokekinawod.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/56002957548.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/vasarazajazonov.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/70124427118.pdfIn PDF document text
    • https://techlan.pl/files/file/kefinim.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ra9qbj4jgd483up3v3qbgsuu41/37581988852.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0a6c1feec---muvipijigavuwepa.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/307f453058dca860ea50922f0c8ee610/525080530.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/gawofafiguji.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/30290338087.pdfIn PDF document text
    • http://identik.hu/editor_up/20381286482.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131930ace678---44245556994.pdfIn PDF document text
    • http://ge-mak.com/files/xufunujesovimun.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/40782168710.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_off0000e1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EE 10692 bytes
SHA-256: 14be2679ace639166b86b41b9e97202dc11c0d7591a08147bd0b40a12482a84f
font_01_sfnt_off0000fa39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA39 17108 bytes
SHA-256: 638513c68caf131b8aaccdc103d97a2a6e9e0d32b44a1dca1a2beff7023812ad
font_02_sfnt_off000126f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.