Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab98d732949badc4…

MALICIOUS

PDF

69.5 KB Created: 2021-09-01 17:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5fc57c656ac7e2de7b33f571e4e5ce09 SHA-1: 93932cbd11d907637687365203e09a74716a1a98 SHA-256: ab98d732949badc4df9b54070fc42619ae0cff7359103769ab0dbd1d8fa87be0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://smidgel.ru/uplcv?utm_term=wordly+wise+book+4+answer+key+pdf', are likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=wordly+wise+book+4+answer+key+pdf PDF link annotation
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/25aaeac4d6775772e6e3af1b3f67bea4/xegewewesaluba.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5eef4e9fc---jasepobivodagug.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/4604076472.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/bagavimopulebukatefo.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/guripurezototisewet.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/12528241780.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/55156389401.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/be1325210fbbbd846f394ca777336391/kilamikuberatu.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607518654b201---xenuzelonitipiw.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/20367829218.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210531_125944.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/39319769119.pdfIn PDF document text
    • http://uhorder.com/upload/files/wugetimadowovulu.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/e6c6805fd0b1d5fbd285d6b17c5f5cde/pipabatom.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210727124233.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/zotigibudamume.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/jalexovekunimej.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/kidikujipesoniwumuf.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/zujapiwinibatebuzi.pdfIn PDF document text
    • http://htwy.com/upload/file/24843709994.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/l0iivcn6th7e3ganto819q8aup/murinizisodededul.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_off0000b054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB054 10896 bytes
SHA-256: 20b9d01b897f78a5a9de1744f00a17d9e5c049c8f908ff07890a95b6ee1cb0b5
font_01_sfnt_off0000c983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC983 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE195 15172 bytes
SHA-256: 92019978490f4122b821e24e59a687ac18778e52ebe00f98a8959669f0f8969e