Malicious PDF — malware analysis report

Static analysis result for SHA-256 20173d6ccab62ad8…

MALICIOUS

PDF

86.3 KB Created: 2021-06-27 17:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d2ea587b00f64fe6c39c74ea5f4ea1f SHA-1: c2161ffa47fcd0c73ddfe794c79ca3aad8fa504a SHA-256: 20173d6ccab62ad8a2a0f263af3e565a48ac87480ad0193de849ac67bd4c3105
196 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 numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or credential harvesting campaign. The presence of external URIs and link farms on disposable hosting further supports this assessment, as these are common tactics for distributing malware or leading users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://krisoc.ru/uplcv?utm_term=psychiatry+research+fellowship
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607252d012cf8---48534584059.pdf
    • http://stlnsk.ru/uploads/file/16445400952.pdf
    • http://ottotech.center/userfiles/file/petelaro.pdf
    • https://ancoraeducacion.com/images/68065899957.pdf
    • http://kvbm.org/pds/userfiles/files/loxebenanesufalunif.pdf
    • http://botosani.ro/img/uploads/file/sumamokagolato.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/dp0n4r68l57vpp6q8ajg12bpk7/namuli.pdf
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/9068738983.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609835b34d956---43990712853.pdf
    • https://proxus.nl/file/tariket.pdf
    • http://abaj.cz/UserFiles/File/ramudozupo.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bacd21285---gupegupugiwuduvivafikos.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/hf211es5l5pf2slmj76jqj12rf/mogumazupumi.pdf
    • http://eviljoy.com/UserFiles/File/sikipodejuwumurunefazip.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/c54b691d1849c1285b8a636948f25499/wimidafapebusagemekezim.pdf
    • http://xlsferrosilicon.com/d/files/gilikevozojenejobiwaw.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16076dd4eee78f---gokabodaxewedibez.pdf
    • http://simonide.org/userfiles/file/salukasipamudegut.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d07cfc63154---95266804614.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d0f1b6e72---25774494671.pdf
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/nukegigibolemiliwizoxovut.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160807062204f4---59870643085.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606faddd93219---juzodojesajudawinekuro.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16084bdc75c3fe---73644592509.pdf
    • http://flygarfield.net/userfiles/file/10984706751.pdf
    • http://samtekelektrik.com/files/wexoxivumuwa.pdf
    • 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_off0000eb77.bin
ef6a6d8b235a09f67d68109c446f038860275fc5e492cc3e97d6e3bbabb471be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB77 10672 bytes
font_01_sfnt_off00010433.bin
1c595666df1571a30a6bc2b0422e337dbe9d17fa0e7a9d6877d1fcc862440d46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10433 17576 bytes
font_02_sfnt_off00013230.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13230 16792 bytes

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