Malicious PDF — malware analysis report

Static analysis result for SHA-256 f250da278009fa4b…

MALICIOUS

PDF

87.7 KB Created: 2021-08-03 04:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2d2fee20e3b0f6a8a77d5003d8f8292f SHA-1: e420676fea9bb5a0e9202b87c6838e2384650184 SHA-256: f250da278009fa4b9e9a873ff36f1b745f83f0291e323e759b24ee2d6531e6f4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to malicious external sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=how+to+get+more+gold+bars+in+candy+crush+without+paying PDF link annotation
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/2a12a01cf3d52b6fb4becab33ffd7260/41421189463.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/29788721272.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/pimijodususoju.pdfIn PDF document text
    • https://aspirans.com/files/file/bovotiluzorun.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/solagafajaze.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16079589cb79dd---57824030128.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/77bd85634c47acd43ae8ae42167b09ff/nolekimigefibojux.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/63075673971.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/vitasoluluvimowasad.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/29836512294.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/43118362987.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7cddf0002---87858833837.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/mugolovajetufibadozipux.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/lumiriritodurezomow.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a9htuoh1akrqd6sukaku6pufm/pisoxuzogu.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f54c26b40---25015238319.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/pudomefibitalafixure.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16102bae5ba815---93842015202.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/vexatalilunox.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b572018fb7f---sifanigaxigefuko.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/76955106757.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/90174792605.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d8d95671046ffd4f7bdfda51dcb5b1c5/fugakebukutor.pdfIn PDF document text
    • https://esvigo.com/upload/files/bonijexoduz.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_off0000ee9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B4 11392 bytes
SHA-256: baad6358b974bdc6c59d0fec3f81a1e3f35dbb0b4aec59b70024ab77ce228fa1
font_02_sfnt_off000120f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F5 18248 bytes
SHA-256: fff8322984a800dfbcbb12089edf2bbb2b16dee10f5d1afaac3bc9a602bdf385