Malicious PDF — malware analysis report

Static analysis result for SHA-256 529cff4a4b606f71…

MALICIOUS

PDF

68.4 KB Created: 2021-09-25 10:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7fecdfff07f6d573de360d6d042d2855 SHA-1: b31b45f03cbb47f360c24dfec1eaa9671474bed5 SHA-256: 529cff4a4b606f71501e94e6016c07595908bb52b0e79a873a66aa1116551b79
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the primary indicators are the link farm structure and the heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://kpdb.org/userfiles/files/81744673506.pdf In PDF document text
    • https://kaimano.it/file/45476699777.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/wimikepeloxusedapu.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/64451303361.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/6727548303.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614aca5ec1561---penuvukekabikirisumef.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/32162663748.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/wavurabof.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/3d43464aa27b3ce93938a513fde45316/vepuwelaja.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/gazupaluvevewipanume.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/8f4fd67675b3a59bfcc9d4e94d90a6c3/vuxajurimodawosutifak.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/teguvibusaf.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/disenenaripi.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/79498038650.pdfIn PDF document text
    • http://3sdent.com/upload/files/lizulisub.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/b0suprkotqks4vo43ll2smfp74/38300517331.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/fefumowaxep.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109251102132851.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/20349790673.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fee27de10e---99845794752.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/milutelevaxaxabe.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/34206541793.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210919_915FC5FA8707B297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=curriculum+vitae+2018PDF 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_off0000ae8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE8F 14828 bytes
SHA-256: 4b99925f1c79ad7e026434c544fc01e7a2627225a26a6c59a9a4fe9f4381cd95
font_01_sfnt_off0000d3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A1 10696 bytes
SHA-256: 0dc8d37f7a0fd3c969878aa512762b8c88f95ab0b54831bba45f1f10d5c84f93
font_02_sfnt_off0000ec5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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