Malicious PDF — malware analysis report

Static analysis result for SHA-256 af729f8fa349217f…

MALICIOUS

PDF

96.2 KB Created: 2021-07-02 07:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1d5af03256b6bd1d686faa97014b89a2 SHA-1: df87c0c123bdda8fd1242d7aee2f0a8efe79952d SHA-256: af729f8fa349217f4a37aa63f839a49a3ffaf066c1a2448afc20d95124f801e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farms indicates an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

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://pistant.ru/uplcv?utm_term=the+meaning+of+hypotenuse PDF link annotation
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160943f652e6d0---52196423984.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/rofiwebulipipol.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f6140fa0f---99163566003.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa5d2bbee6---15814982279.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/33777752635.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/31127786384.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/wuxiwunomowunenewusug.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/6ae8e504d168327c647ed310ff568235/boponewujimax.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/74402823264.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/nuwiwidi.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/towuwoxixanadufosin.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/fokutigogekarotul.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/56283576832.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4107b24eae---bawopad.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a98a2f12f---budogigodokoxopaz.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/06ajcah6tvp9e8nsbqm88peio7/87790795083.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bd8c09fb3---43784140836.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b80ba86e34c---togukaxotusazar.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160808514e8c42---wirosa.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba876e60f---kikivuzelu.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16079d7e04a79d---jafaluzumupinasudowip.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811082d5a65---11868777537.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/27537517983.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/1e64c17b413b778256c7806b8628cf30/16608249134.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000d223.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD223 18632 bytes
SHA-256: 2ffa8d7078a98631a0320bed2db7f3d2bdf48e3c13e60f8b0d79ae7697373d35
font_01_sfnt_off0000f0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BF 10836 bytes
SHA-256: efffd4f00c49076e58d397aa535d3c2fdb90d167daa881a6819c28f9c077cba6
font_02_sfnt_off00010998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10998 4072 bytes
SHA-256: e0cb731cfd75d1b494075b85550009b5d5f4233d872c1fa210e9afcaabd54562
font_03_sfnt_off000118cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000130df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DF 26776 bytes
SHA-256: 6012f47b7c1841e6a88c05301d9fb0cefd145b20962498844046878724781cc7

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