Malicious PDF — malware analysis report

Static analysis result for SHA-256 533f823b54dfd225…

MALICIOUS

PDF

92.6 KB Created: 2021-06-30 10:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08de3e01661f24d67a2c5f7710a4ba64 SHA-1: 4c849be6fdc7dedfdaf207e39e4ce9736ed5eabf SHA-256: 533f823b54dfd225efa458daeef5e372b85285f87df6556a57d95c3d5b57e8a4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable domains, indicative of a link farm designed to distribute malware or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b36840ad6aa---jifezawuw.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a3b52c668---25918149210.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/5d977f74ac2f504cf6add5ccc8d856b8/33857053759.pdf
    • https://fairtradeportal.pl/userfiles/file/tixapakigimezaraf.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6cc6a14fc2---56666287997.pdf
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/289ju0ip0i4j505et29i1nin30/jazefovadodunadirasito.pdf
    • http://bellina.pl/userfiles/file/nekunomogorosa.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/88fa0bedc69de9a4426a640da05b0a6f/76266031276.pdf
    • http://minhledtran.com/luutru/files/vubejiwunasomaro.pdf
    • http://wurbs-hanau.de/userfiles/file/kivananukitoj.pdf
    • https://global-brand.net/userfiles/files/wumol.pdf
    • https://tangente-mag.com/img/file/90587563448.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160ae09f74809b---28893848612.pdf
    • http://www.europesolidaire.eu/userfiles/files/39103996926.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/6ecbf2796533326bbd879c223a6f6ea8/46270581708.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f30d1c308e---67588226925.pdf
    • http://angelcabrera.com/FCKfiles/file/20086577937.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5d8e3aeb8---95230972771.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e870eafcbc---kunofi.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/7ej6m168r0j9aupb6nvb622i9e/migolesesabifujifuzarofog.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rimuqomsg4pvgos3fvbp0e8i91/42215502039.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/db2a7rfmlefjkpm4klkc1d3bc3/27776896944.pdf
    • http://arci-mp.fr/admin/File/51076582645.pdf
    • http://1utilaje.ro/mm/file/12030132950.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b2c9b39fa---4221174311.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/99328650176.pdf
    • http://polyacer-ecp.com/userfiles/files/20210629_041106.pdf
    • https://reitinguok.lt/userfiles/file/57908090327.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+name+a+name+tag+in+minecraft
    • 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_off000105a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105A5 16792 bytes
font_01_sfnt_off00011dbc.bin
1ece4c83a4bb4d3268f97dc5dd8c645a01387b8c138bb235ab9e801ccd4a81e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBC 10540 bytes
font_02_sfnt_off000135be.bin
d54f5d8f52f182b2106307fe83d804113e9561de041384431e4be5b223530fb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135BE 17316 bytes

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