Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec954b92f2069d73…

MALICIOUS

PDF

73.5 KB Created: 2021-09-12 05:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 34ebf1fbada0f5ab0ada2438f94b0c71 SHA-1: aa8f28a817eb753fb6f03f2f1ab232ef2ff1279f SHA-256: ec954b92f2069d73f5bc7fcfcc526566d49679779bd715b12fdded0a6380e729
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URLs, many of which point to compromised WordPress sites, suggesting a link farm or redirection mechanism. The presence of these links indicates an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://medvor.ru/uplcv?utm_term=factory+reset+on+mi+phone PDF link annotation
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/dipt9c0m798pbhod92n2s7gsc1/41925349794.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/bidonezerokurigirajojalo.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/ribudijadororefujixi.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/nogajafazinubufedo.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/dafijawekaralodi.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/13103037349.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/37675332482.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/76794210467.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/7e5a15b9249b3349c109c92d77e97fdf/44114346085.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/9045924381.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/18075968955.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/67921083576.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135d6a763309---68601852679.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/52182724061.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/49e5c750e78fc4ec6b189b4352a72bb6/39556133096.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/fuzugexo.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/82975738720.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/medizuxuvitowofiko.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/76628657265.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/jewusuze.pdfIn PDF document text
    • http://keacg.com/upload/files/9918666498.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/74372966602.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_off0000bbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB9 17280 bytes
SHA-256: 4748253f93ebd6c78e27d02c64779f99f6586b287ed4cc7ef9a0b0f8cb78d645
font_01_sfnt_off0000e7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FF 10684 bytes
SHA-256: 30bc69f1052afc7cf4e1df75049acdab50655e8de82be4baf6e04d5f85240de8
font_02_sfnt_off0001005b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1