Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe780a734e00f5cf…

MALICIOUS

PDF

74.6 KB Created: 2021-08-27 23:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 29ad5a8ad50f96fd6c7edfefdadc0222 SHA-1: 73fe0f0c228c760ad1d61ae48b3d1aa841f87cce SHA-256: fe780a734e00f5cf020eb4c5ffc0c627fdea1daa6716746a0acf9a854a1cbaab
156 Risk Score

Malware Insights

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

The file was flagged by a ML classifier and ClamAV as malicious. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised WordPress upload storage and disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://extrastyle.ee/ckfinder/userfiles/files/werukubikonuzudesob.pdf In PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/lbf3b6rf68ob29d4hvo2o62bp1/xenusabibumurokuxupew.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2057166c3e---34844161381.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/zulazadigi.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/52524868450.pdfIn PDF document text
    • https://nakshistudio.com/ckfinder/userfiles/files/vomemujivo.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/89915452953.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/42598051352.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/38369265711.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/6f1rf99cha82j12f1ei36k2s3m/62527751507.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/65948890226.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adcc5d067d8---zavumilidipuzaluvuxulam.pdfIn PDF document text
    • http://apple888.vn/luutru/files/43516790636.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160ba71a2503b8---97372988120.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/vosanarosamudabifugugav.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f111dcb772---porajagusumatijuzavu.pdfIn PDF document text
    • https://miet.hu/kepek/baradovonubupu.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960d5c72017---24220215541.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/91464518000.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd562afb28---wekixefisezekomef.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/34379544590.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/4ee2f02a14eb2658fbf7268af6ef0c69/lozaneja.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/35419847426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=does+man+likes+shy+girlPDF 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_off0000c2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DF 10664 bytes
SHA-256: fd9b3330fee5feb0d3e276d196804b30371de426ecbc630eff36ab3d0bb5d985
font_01_sfnt_off0000db13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF325 16220 bytes
SHA-256: fdc8155e9509ea1a6506973ec1f78726abbf6f0077b9698494b3fdad7e8fd1c3