Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f911e0c9d7996bf…

MALICIOUS

PDF

72.0 KB Created: 2021-08-28 05:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7071588a6fb107dc4c4c7d5c756cd64f SHA-1: 343a00c745854b8369e0444c944fa3a2a10f1977 SHA-256: 6f911e0c9d7996bf8a6d3bed1c96080e01520005e195a51b3757094104b8d7bc
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://budoprojekt.eu/obrazy/file/benegilidudenadesidomidir.pdf In PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/019a9317eb7876efe536e8bda0a4d3de/16230583793.pdfIn PDF document text
    • http://bangkoksolarpower.com/syner_upload/images/files/25566262679.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/76756913548.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160751b9748ff1---34792832326.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210823_191852.pdfIn PDF document text
    • http://luatsubienhoa.com/upload/ck/files/motuzikelexedaramo.pdfIn PDF document text
    • http://netflor.pl/upload/File/wiwakebupi.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/q9cfd9ei4k279sknh47hmofttu/96309407158.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/devizamivofeg.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/dlpf12v5qlvfetpsflco4uh9vr/rapegofabenuvixewexom.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/8iitmv4mav702hfs2391drk8jn/dikofevibu.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e9f9cc37d---wugigonur.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/10694982710.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/93c8e97e8519c7424c108df9112d4307/tevam.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077806039dd5---53874144385.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/libixakilapunejud.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/watimuxarub.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/jerufusifupipula.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a4893ae24191cced1cd8b58a7533ca24/64080310927.pdfIn PDF document text
    • http://china-zzld.com/uploadfile/file///2021062611492564.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/2ad5fb17f9c7b313893642f2eb22abfc/56345208633.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/buronodeguveguxajamutuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=vowels+with+pictures+worksheetPDF 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_off0000b96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB96B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17D 15612 bytes
SHA-256: 36ce8571c07a32ee0f1562421db768f10cc1827673e7c0a72a81e4279b087865
font_02_sfnt_off0000f8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AC 10452 bytes
SHA-256: 0c3b68b16385cd5986f4506f2ddf4c121e1513bd54737e7e7cf2005d0bc17c0e

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