Malicious PDF — malware analysis report

Static analysis result for SHA-256 8870d0445c985f5a…

MALICIOUS

PDF

81.7 KB Created: 2021-09-08 01:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 935526e15490a7c9050f685e43118337 SHA-1: 42fd55e0428160d85c3550e88e716d28df37d894 SHA-256: 8870d0445c985f5a5e2d0ff885d8bfb50daede60a1cd5b3b285c118d33cdd269
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://martabaktelor.com/contents//files/jomadaxuzugav.pdf In PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210831_075842_6164.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/c29f8da7aa47f2c7b9da9f2b23ac00d6/8799961269.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/79438570338.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/82340579242.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/fisozo.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/wiwofigulozapofadisewopos.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/85797248585.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/1281652478.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-7-4/20210704104143344819.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/cd7640dec8c171be66f1a657f6ce305e/33930834418.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16095e52615c18---66162624794.pdfIn PDF document text
    • http://proxima-design.cz/files/file/98870177192.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/lawetefadogavelive.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769f25dc324---86283425098.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/2mn079knf5nrd2vo2iakusjn7i/nifokebatotevomo.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/pifuzad.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/23679239471.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/kn2usd2dnkrgri0k1flpjodcct/zututosofoz.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/konupetagemenu.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/39956715305.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/k94vd2l3trkb4tfn2qq18lhuba/28614876852.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/futerutizus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=cesur+yeni+d%C3%BCnya+pdf+yandexPDF 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_off0000d6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E2 19408 bytes
SHA-256: 3593ebd28ed27a51a785a79085d3c122d168304ea5a91c4a670804d28721f513
font_01_sfnt_off0001068d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068D 10768 bytes
SHA-256: 3285f0912b927d87a8bf6138d32e104a4b58ffd315c500d3daf339cde75cd70d
font_02_sfnt_off00011f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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