Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f27878abc5a2788…

MALICIOUS

PDF

89.3 KB Created: 2021-08-28 17:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5ba8987413e5f8d9c2ae918b4d04cbaa SHA-1: ef8695a2fae78b9cc45e4f509fffa130d7913f2f SHA-256: 2f27878abc5a2788796c73896e6ad963692017b2a21a7b110566e217f26fe821
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. These links likely lead to phishing pages or further malware downloads. The ClamAV detection and ML classifier strongly suggest malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=max+weber+protestant+ethic+summary PDF link annotation
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927375c2af6---79205843817.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608921144e04d---tamozijazon.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071abd78c7d8---22350388406.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/31896345383.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/guvobidewiv.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/25a1a18d42b7251a089ec6bf6d278cb8/jasobuzox.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e884f7bae10---xizolirifuni.pdfIn PDF document text
    • http://simonide.org/userfiles/file/kakojawebekefipifuxudawa.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/gukubuxevepuz.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/wojixerevijakivutoguwu.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/inn3sejqn74pr61m2kpd88t93a/pavufen.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/fbbc9fedf0363c0e89bac6b1761e9d2c/nelenepir.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1629838613.pdfIn PDF document text
    • http://uhli-janmaria.cz/userfiles/file/11297817802.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5af49f99c---nuturupomewenavopelipu.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210802_7F0D25236600A42C.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/meliwidozi.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/72b4d2b463d78d986b6048493ba85b33/65237112854.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021072222455673499.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb049ad19f9---93783786081.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/gejodijuzusegejaxalutur.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/58047488043.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/2pkanvipkfl3ojoadpkqr2ftes/lokuvavuvu.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_off0000f394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF394 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA6 19076 bytes
SHA-256: 0fbea1134f76047228950ba1a11526d75c10688666113f0ed6864f7190fa3852
font_02_sfnt_off00013cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB6 11128 bytes
SHA-256: ce57455135fd286c09d60ebb60d5adc92c10c048a3e5aff95c7565c5c4216758

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