Malicious PDF — malware analysis report

Static analysis result for SHA-256 27bd4308b4b2526e…

MALICIOUS

PDF

86.7 KB Created: 2021-08-16 14:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b17d581c128f33dd05e1864d5d3528e6 SHA-1: 51b164fa9eaf8ebe1b8b2374b846236fe0358847 SHA-256: 27bd4308b4b2526e0e51cc90a5da88f931b51048ec8fd4e5963fe36cc910ce17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress sites, suggesting it's used to distribute or host malicious content. The presence of external URIs and the nature of the link farm heuristic point towards an attempt to redirect users to potentially harmful websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/9f3m0h911u33i2i3mefn6glp0c/mivotarivugilesol.pdf
    • https://mwasafat.com/uploads/files/10201675330.pdf
    • https://thechoose.it/file/80783273417.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/744d3665e0b59bd8d86a9cd6f8c161b1/videfuripoxujeweja.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/fa3a513756a24339e63b361f19bd38ee/julekepozupusiwiverigumek.pdf
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/wijoremi.pdf
    • https://cgeminfos.ma/upload/file/10826432231.pdf
    • https://aashianarealty.com/file/lepimonabebuweluxawazif.pdf
    • http://inwama4.vn/webroot/img/files/vitikofereruletege.pdf
    • http://studiogaleazzo.eu/userfiles/files/92553959083.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984a97a8740---46687293424.pdf
    • http://kaies.net/upfiles/2108152018327950721mb7gc.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/4574f9835a2944b5710cdc0bbdaecb42/19865946138.pdf
    • http://ugrctrani.it/userfiles/files/pipuwuwovim.pdf
    • http://skiflogistics.ru/userfiles/file/86998726651.pdf
    • http://seabeachthailand.com/UserFiles/file/sivinuwutiwawo.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/h9e15d65ph9ot1tplq736dk385/peredoxos.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=what+to+write+on+a+blank+piece+of+paper
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1fe.bin
9345975423637d70d556c5f42c71cd988df1829db56734972a394b74c2d1c0ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FE 10720 bytes
font_01_sfnt_off00010a5e.bin
0f8391ff768daf4158f9cb0b7bc32ba4973094f924fd69c65969853a518edb90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5E 16664 bytes
font_02_sfnt_off000135b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135B3 16792 bytes

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