Malicious PDF — malware analysis report

Static analysis result for SHA-256 4127bff2173393cc…

MALICIOUS

PDF

83.1 KB Created: 2021-09-15 19:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6a1abd40d1141a1b3824eee652ea6aeb SHA-1: 4fdd2eae992bdf3528b06b06132ef1ac5439f25c SHA-256: 4127bff2173393cc9938fca9fcb55cc0dcf3d0740d85e28b4880a21921573023
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a link farm pointing to compromised websites, suggesting an attempt to trick the user into downloading a malicious payload. The presence of a 'download button' heuristic further supports this phishing lure. ClamAV detection confirms the malicious nature of the file, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • 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.
  • 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.
  • 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=ludo+king+hack+root PDF link annotation
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gomojat.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/jaxanetozajojip.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/kuxubogukedobufalub.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/zafirenusiju.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136c6b49c777---16164969956.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/kebunezofisabogatajesese.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/kl6eiqju4mdsg0usfcs877a3e5/pakivobogedexiviminogev.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/57167531419.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/69362982945.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/58752062135.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/xilugavelidomasujukibusom.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/nudipukunigabawexuj.pdfIn PDF document text
    • http://sgpeo.pl/users/file/nonadegokukidopusojubabu.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/1aa50ad933ec4ad15e762d90ad8c6830/dobuzarepuka.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/winiwijajokeva.pdfIn PDF document text
    • http://speckrepej.com/upload/file/xukixowugotekoxitunesu.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/18846602317.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/tasedonowemibaka.pdfIn PDF document text
    • http://perksys.com/userfiles/file/67385315129.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/85006099498.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/busuzemolupenusef.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/nanuba.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_off0000e170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE170 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF982 17580 bytes
SHA-256: cce4a0c28011bd0b33b41a8739e39c6334a84b6ce5ecb81f1f00381494a2ebb1
font_02_sfnt_off000127c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C0 10452 bytes
SHA-256: 8e76d5459d89b8b665167daed6443d4f49b4c2bb1b3eba74408af56e08d5feee

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