Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ece58b65c041c0e…

MALICIOUS

PDF

73.4 KB Created: 2021-09-07 18:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cc98561983f134f67935b43874461213 SHA-1: e21acba36dab3fca6a7858503dee83238669a615 SHA-256: 0ece58b65c041c0e43de276cab10b20a8a0dc41245d995ed46cecda0f78c4c1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's designed to distribute further malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's part of a phishing or malware distribution campaign, likely using embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://bipalisdemo.dashindonesia.com/userfiles/files/22383995812.pdf In PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/norur.pdfIn PDF document text
    • https://cmoretv.com/userfiles/botagizodaxas.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/tojejatax.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d224e497e01---74886914532.pdfIn PDF document text
    • http://jp-cable.com/d/files/tikexurupizixojonase.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfac4ae5d2---84072910182.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/1f47166a8123c5f053c2f2274e92df05/38204880683.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/c8d6082676abe6974c1e80992d10596b/koxipumokutebebimamolat.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/73543953744.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/3716883903.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-6/20210906172805588842.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/53938294184.pdfIn PDF document text
    • https://adium.ru/userfiles/file/22713481497.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907f00d50da---xijovumiwerujowefebizepas.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895e09c3b38---43250468065.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffd9c384cc---teniwexifezesebukomo.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3334b6f5f---44254675078.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d68d36b76e7---7517708211.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/5237040904.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/20609712485.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609666e4e97b6---88852473808.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210820_90C3ACC50705D5AF.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/59149054845.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=colesterol+y+trigliceridos+altos+en+el+embarazo+pdfPDF 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_off0000b93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB93C 17860 bytes
SHA-256: 29938f97eff91dbead04c6037a95b9b56e011ae6fd6122e0970f20a721dc8a63
font_01_sfnt_off0000e560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE560 11308 bytes
SHA-256: bb79d972d38b3825f930147d56c014d314874e93de2e98b7362d3df8582a0dbb
font_02_sfnt_off0000ff9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1