Malicious PDF — malware analysis report

Static analysis result for SHA-256 721f0b1b18f34088…

MALICIOUS

PDF

75.3 KB Created: 2021-08-28 06:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 72640bcb6e99da91c03b31f867854f85 SHA-1: c503f8555a64c02181c897943e0124e6821cf07e SHA-256: 721f0b1b18f34088287e4423febc0f7fc3091bcaebef7fbec64b024f64795d53
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains a link farm pointing to multiple compromised websites, suggesting an attempt to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the malicious intent by identifying links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://duda-tech.pl/dudatech/upload/file/38975346965.pdf In PDF document text
    • http://afghansolar.com/userfiles/file/fuzogiginogixutaziku.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909d89ba292---mevoxezalirefizifajewo.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/nufozopebotinaganom.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/tuditepez.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8604390d2---xikirira.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/30611070946.pdfIn PDF document text
    • http://deforma.it/userfiles/files/fofazisokokogowepenoxi.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/zigej.pdfIn PDF document text
    • https://www.nitdgp.ac.in/uploads/userfiles/files/ziresada.pdfIn PDF document text
    • http://chikatere.com/Upload/files/luwazifexiwifusuboteze.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/8da7dde20e3602159d0b26721fe6887b/56941495495.pdfIn PDF document text
    • http://bostonmentors.com/userfiles/file/wazamafugiwon.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/47463235346.pdfIn PDF document text
    • http://st03.it/userfiles/files/98016987042.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/usbh6prqvlp615bs3lpr9n0esp/gekumepuwaxam.pdfIn PDF document text
    • http://ippon.lv/uploads/File/kumom.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/vewefobetetavegopojanew.pdfIn PDF document text
    • http://tumonjfk2020reunion.org/clients/f/fe/fe8b949e9fe7e5065ccade199761aacb/File/90726944825.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb1f7b40d9---97697631622.pdfIn PDF document text
    • https://topupdana.com/contents//files/tegagan.pdfIn PDF document text
    • http://sakra.sk/storage/file/7705758230.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+playbook+kwame+alexander+pdfPDF 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_off0000c266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC266 17200 bytes
SHA-256: fd3b10b384934a8029ee093c2f3a1238e817ac721fd261c9455d2dcb196bf7c5
font_01_sfnt_off0000eeb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB7 10900 bytes
SHA-256: 1576b35360acd4c3d9ed434ea7074a45d4fa1aa728ee2eb6897543f7c119ea58
font_02_sfnt_off00010799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10799 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1