Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a1798b69f1029d…

MALICIOUS

PDF

96.2 KB Created: 2021-08-22 02:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a8b2ad212d7a0f96063a462103855309 SHA-1: d28563e8f4541c85c256895940e2568ba86a33ba SHA-256: b5a1798b69f1029d8b73c703b52032b9ccfcab6915f98582401761131b67fcae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://huntic.ru/uplcv?utm_term=whatsapp+plus+last+version+uptodown PDF link annotation
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18bd4dc5b4---nulumetinaf.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/33832534248.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c43e3a3c1---87948317582.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/jifesusobuj.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948db819154---tejuxabebitake.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/71c535c3d4391807315db2e3868df981/35018467871.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/15446997334.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/12768576587.pdfIn PDF document text
    • http://flomojapan.com/upload/files/bavuturowujupulizuxade.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/fedilitiwagajesasabiladub.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/37481667736.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ib36bkoc3fktb14tj0prtc7as0/rotowowomijo.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b76d5942961b7784879cea91d8fe8f1b/lenikapokanepefaz.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/masowivonodexinedenepoz.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a40dff6fa7a---ruzegovuzowofexutepiwaw.pdfIn PDF document text
    • http://93564497.com/userfiles/vopokodenabefepitula.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbeda39736---jofogenevata.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/8d5f0a4aa8c44242f4966d959526aad9/gejivuzogu.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/11704879486.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/70659626105.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/54045165750.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/6229957955.pdfIn PDF document text
    • http://sumterhigh89.com/clients/863574/File/14308183839.pdfIn PDF document text
    • http://asustainable.com/global/file/81678011576.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC44 17456 bytes
SHA-256: e6486af57494294defd6368c836482e48d144d2ed76af323f64b2e4f8988bc97
font_01_sfnt_off00012a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001423a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1423A 10736 bytes
SHA-256: bb15c2cd0dee15fdba0229230b770c73b0a70b75f22206746c70aecaeed6cb91
font_03_sfnt_off00015ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AE2 16420 bytes
SHA-256: 90e009cff8254d069b7782410d50a3e584cc77a56f3be479151752ef3df1a005

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