Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3ceff44ca9d0ed8…

MALICIOUS

PDF

70.9 KB Created: 2021-10-01 05:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1ca38e22ddf04ec4a7f798071a10ebc6 SHA-1: d085e4b03aa24b81241cec709952fd875d79bc12 SHA-256: f3ceff44ca9d0ed8d5ecaca0a00f4e2635ba6c1b71140a4b6d7a65495be5bc52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure suggests it's designed to redirect users to malicious content, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613590d985238---banojol.pdf In PDF document text
    • https://exlite.it/ckfinder/userfiles/files/5356222190.pdfIn PDF document text
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/82330318209.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wevudedel.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/7879195052.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16140378f989ba---zagudej.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/22348845836.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/ratufoporuradarepa.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210914_E63A55CAC651A5DD.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021090117113973499.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/225ce5f935472e9c492c14efacd90a11/lixoteranemoramim.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/bukagufusawepidufel.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/11532217155.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/rutowuzutefapuludu.pdfIn PDF document text
    • http://konberdbio.com/upload/files/josogavow.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1612f73476105d---jexedusojakazifogosag.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613229985ecb1---mefepusujibukadasujorilek.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/62961683520.pdfIn PDF document text
    • http://eva.am/files/f2b09a8331172d37.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/witefenojivixilijuwemax.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e1694e4d3e---5791887875.pdfIn PDF document text
    • http://northcity.rs/slike/files/muwotadamifemoxugu.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614de066aa926---96157778497.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/37239983803.pdfIn PDF document text
    • http://ciskmv.com/css/file/lobevewukalugun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=trolls+world+tour+putlockerPDF 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_off0000b534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB534 10388 bytes
SHA-256: 701dc8c33cf1f40144a3aec3b0a8e27b5e40eafcdfadd8d25bcafeaafcf4a522
font_01_sfnt_off0000ccfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50F 15768 bytes
SHA-256: c49629f42c0e02ce6b72609e416f075c1608b6ce8b9905b692baf09a5c5105d5