Malicious PDF — malware analysis report

Static analysis result for SHA-256 890cc2602738f08c…

MALICIOUS

PDF

68.7 KB Created: 2021-09-27 16:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 625b98995f3d5c2c0dc8b2056a4ccb25 SHA-1: 8f4ed54b72d71d11b195c9e73aef8c393e642925 SHA-256: 890cc2602738f08c3b3ad9aaf85f243100bb917f1a5b4e62878a51aa5afed203
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://irlanc.ru/uplcv?utm_term=3d+prado+parking PDF link annotation
    • http://aedjtjdshbf.pretty-match.com/upload/files/16746659976.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/tn60lb0avp4rtvdpe329r23ll8/35194575492.pdfIn PDF document text
    • http://temple.mo/userfiles/file/75691020510.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/fawegek.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/penogiwazubuvazi.pdfIn PDF document text
    • http://sial.pl/galeria/file/nisadekujaluki.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/tinedo.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/116430846.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5325a5420---vimebezogijuxuvoxubuta.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/5590549440.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/67930714555.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/pedafekivebugowal.pdfIn PDF document text
    • http://dominant.name/userfiles/file/zotezizemoj.pdfIn PDF document text
    • http://metallpress.ru/files/91242643877.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/1890101433.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/wotokizopufaxig.pdfIn PDF document text
    • http://centre.annuaire-regional.com/ckfinder/userfiles/files/goworapasajokor.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/74979699932.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311e25a5117---5655869179.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/9505830183.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/vazifarofusar.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/17374266519.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/sasawavidisiwipofesimifak.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/52945202439.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_off0000b0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B2 15024 bytes
SHA-256: 28ee9d2d450bebfc42300518ded7baf4c894b2d6cfc6e0f9b6b72b62529e6e43
font_01_sfnt_off0000d674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD674 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8B 10292 bytes
SHA-256: f24ca14a92d1df149011bfcb3f2f129116e96551590aaae59d8823130ab2409c