Malicious PDF — malware analysis report

Static analysis result for SHA-256 27f4f734825659a0…

MALICIOUS

PDF

76.3 KB Created: 2021-09-17 02:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 077462d5ca5cb4f2c0d5fd230539f305 SHA-1: b9916c132b90fdd79c457b3b9ad02f57231ca31f SHA-256: 27f4f734825659a0fb2e5afd1c092f1c3d5f84b7493546075baa4f51d6cf9e06
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous embedded URLs, many pointing to compromised WordPress installations or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://irlanc.ru/uplcv?utm_term=transporting+fridge+laying+down PDF link annotation
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/a6p25mftgdponqspcpbm9a22k4/98821042861.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/fiwukimumojopivezos.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161345c20b45e6---60076671472.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/15023681159.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/25137180378.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/83672607115.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390778899ee---bogekokisag.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/74209775647.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/nobubenajonejotixoza.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9779a8570---24693105678.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/jelitexujarebod.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/71792876199.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ngfhcioflk38c2geqojsss58h3/29090734047.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/mozexotel.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16143cb6ccc362---kipira.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed301a2665---15812035955.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/7143349277.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/80664366140.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/tatotubifurabikigos.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/51282161281.pdfIn PDF document text
    • http://halmar.info/userfiles/file/vesim.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/mirifutafakanuvixiso.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_off0000c6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A1 10836 bytes
SHA-256: bab837e91caa132e437d04736622fffbc6fd392a0379fd9cf880d0a6c9d5e35c
font_01_sfnt_off0000dfa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA1 17300 bytes
SHA-256: 10fbf873a49cb1e40f88fa51a95080551124bbceeca202582834c4c15aa8c9c8
font_02_sfnt_off00010be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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