Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d8e4bb1c611c50e…

MALICIOUS

PDF

90.6 KB Created: 2021-07-22 06:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6f095118826887f9b6b140144d6b1524 SHA-1: 4e9d50dd6ff3b73841a1f2cfa7b2e0518fed4847 SHA-256: 1d8e4bb1c611c50e6dd798dc0bdd0fa642ca8f1dc918f7d95f889de2c472749a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm hosted on compromised WordPress sites, suggesting an attempt to direct users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with a high ML score and ClamAV detection, strongly indicates malicious intent. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083832277331---zozezonesujubajij.pdf In PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/bebemelegedababojalab.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/busunutatoboxufewufe.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/25199722427.pdfIn PDF document text
    • https://alyansdugunsalonu.com/userfiles/files/mumojabowar.pdfIn PDF document text
    • http://kudamatsu.org/userfiles/file/rozanojiwepopupomuz.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b95af8ddba0---6233304626.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/93131734710.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/9cma09cu4crh4p7qkn0g1is9f7/gabiwekutavapadedanok.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/49439179239.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/8t666r4qnpuobcmf3hk90rkp21/fotevugizurazovosefo.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e318cc0d1---zogopupotuxu.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073a5e4e488e---suzixuj.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/60741229151.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16092d329e1c12---tabusozujakimegis.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160f3fb966efaf---25253907463.pdfIn PDF document text
    • https://soltendance.com/stockages/files/36122173598.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c07eadd8cb---1061440970.pdfIn PDF document text
    • http://citysuji.com/ckfinder/userfiles/files/67264981691.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160982f3877b9d---jegonajixexebipuvexe.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/41aea6b1e0ceb1853aae7828271af070/51463163338.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/50408157381.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///3976002390.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/fuwupugofamasuvoliki.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/0cdgk6ros2stt4j9c4mei5vd75/jumufav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=undertale+game+download+pcPDF 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_off0000ff26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11738 17140 bytes
SHA-256: 1fd94b8630378d16ee0054ac500f289dc0c6c0f1950aee3b3f5c61072acc7387
font_02_sfnt_off00014409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14409 10692 bytes
SHA-256: 26f1f0b0aa84e45ec356d90754e1d2c6cb89508e8fa07bf8e0db62f7313efc64