Malicious PDF — malware analysis report

Static analysis result for SHA-256 af65731f608551ce…

MALICIOUS

PDF

87.7 KB Created: 2021-08-11 16:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 31dd28572dd69b8e50f9bed75a4d672e SHA-1: f23342faf38aeb9abee256dfd6f7133a7be14027 SHA-256: af65731f608551ceed4c76724284575d5be6d654007c7bed75f9b46db6f412d7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. The presence of external URIs and link farm indicators points towards an attempt to redirect users to malicious sites, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no further context on its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://drafthe.ru/uplcv?utm_term=is+lyrica+better+than+gabapentin+reddit PDF link annotation
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098a81499b57---62618644464.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/mipukaruzumezuwitufomosiv.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/42046995275.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/70223468367.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c068f2891---vavulipokunuduzuwotolo.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf5f6827e4---39035041792.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a116486562e---93252504060.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9823fd60df---87777389751.pdfIn PDF document text
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/jifiruvedolaveji.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/wisoxasofewufiriwojig.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/3c4535d6d18124b607699da71a52c4e9/14854958547.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021062502490522.pdfIn PDF document text
    • http://greer2001.com/clients/e/ea/ea56749d84c1a2d7db36d2c51c833a37/File/vavifojolidino.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/07-10-02-36-33-69.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/pabaji.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/xamawojuzizozusupibadet.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/fudewoj.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8c64b3211---714608954.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/65113292572.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d02e3a2812---firuxuv.pdfIn PDF document text
    • http://kimtuong.vn/isc/public/files/fckupload/file/jatuwivovijefo.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9d52c1176---57663706631.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/gubederigolivaliteri.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_off0000f188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF188 10880 bytes
SHA-256: 82ffd85c64887be15a4af9b691f9f9349bd5776f4f261aaad5ebaa55960e089a
font_01_sfnt_off00010a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A38 17872 bytes
SHA-256: cb7a3e83292ec2c9535f5d1bc84029b5387bb2a4d6fd65af7191b4fbd252be32
font_02_sfnt_off00013919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13919 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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