Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4ba39b25c33a94c…

MALICIOUS

PDF

84.0 KB Created: 2021-08-27 21:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d43e8d913cf0e13cd142dbaf2b026e1c SHA-1: 2c08e9837445df062923b8da81e5d688a7eb4787 SHA-256: e4ba39b25c33a94c32939517c22f4dd28909eea61a6ec5597ff1c16fb1317e40
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF used for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://hankilfood.com/upfile/files/vizerubaxadoxi.pdf In PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/44241032965.pdfIn PDF document text
    • https://semut73.com/contents//files/tiwevidipepo.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/5988c9700485eeb5fd06af18bd15598a/lanugegajeledolozexumaku.pdfIn PDF document text
    • https://actor-conseil.com/files/file/23641528829.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c22ec4bd33b---bexomixebojebiwavufag.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/pomava.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/db9f1e25c14a20e9fbdc0347c1199d27/kivuxugowibovoradi.pdfIn PDF document text
    • http://mariancozma.com/_user/file/guzibaraxi.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/36688554066.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/78698375824.pdfIn PDF document text
    • https://cmetrix.net/ckfinder/userfiles/files/loratijewajididakumi.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/lf44fff4k9tme5gld1f63ir4m1/59525171315.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/92f7ecf663c6051920c8122e5d8723b6/30731050549.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758b13f1176---mivevejolilijerupa.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/5e18ccdd2e0123ac502e85770e77f975/bekafu.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/52138635354.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f33654eef47---figagojigeze.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/5068178953.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd8b80fc82---93764367160.pdfIn PDF document text
    • http://paliukenas.lt/i/File/95951019655.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/1cfc34f379e4223ba51ecb6b622d2c7e/jufaja.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210628_182824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=my+period+blood+is+pinkPDF link annotation
    • 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_off0000e0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B9 18472 bytes
SHA-256: dc5e26e0e7a1ffdc5fbec5c924daf40d5f1c1c00db1637f577dce6e492bd648f
font_01_sfnt_off00011144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11144 10464 bytes
SHA-256: 2ef842ea01b4bb5ca3ca51381ed2f532d7d959af711ed1c13a1e37197104e2fa
font_02_sfnt_off000128d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1