Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b71553c148c192…

MALICIOUS

PDF

82.2 KB Created: 2021-09-22 09:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9b151af356b16e41a43c3525bfbe0204 SHA-1: 503ec1f2d7e3672176e791587ac8ba161ff65e78 SHA-256: f5b71553c148c1929f6e5969b6d0878e18817c78d0ea42899a4592f53b0f87d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are used for SEO manipulation or to distribute further malicious content. The presence of 'utm_term=video+call+call' in one URL hints at a potential lure for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

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://smidgel.ru/uplcv?utm_term=video+call+call PDF link annotation
    • https://conrays.ru/f/data/dejububopekukor.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/bawowejadoratomewaf.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/52390912380.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/pemudewedovogumujepod.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/66146268977.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec65dd9202---86975774436.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/nludgeaj45gqp784pbtkure6m9/medolozogipumazamoseji.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/57660626295.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bbcfdb440---dipiposubetuvurapis.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/56211936683.pdfIn PDF document text
    • http://cichanski.com/Upload/file/najimu.pdfIn PDF document text
    • http://gabortech.com/admin/file/kesizifirurajisujaju.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/gotivinigamup.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/a54865638788e483df458cc5be64653c/wigetigalakazafubowidarin.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/68pvs98653jfoji8miinodp036/12208178614.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/59030897768.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/tomerigev.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/vubematobi.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/soterumutelalaj.pdfIn PDF document text
    • http://ledins.lv/cms/file/ninosasikadumebex.pdfIn PDF document text
    • https://empresa-venta.hr/files/32736611196.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/13192237536.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/fawanixukomemami.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/72328101447.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134d09b20c49---kepinukebi.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-19/20210919095703839975.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bee955034---81212792950.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC5 22808 bytes
SHA-256: f8bcf8b9254522656a64833df84edb7fa85514ae9be14d863f27c1a2c6eafad6
font_01_sfnt_off0000f797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF797 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAD 9864 bytes
SHA-256: 2013eea0c67656baf7e85a8f7dedf02310a4daa205fdcaba08174419c6da1e59
font_03_sfnt_off0001256d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256D 16192 bytes
SHA-256: 126aabc53b187bc4421529373f04e2f66a11804dfeaeb35cb650b132d56c1dbd

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