Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f17d5281c02be1…

MALICIOUS

PDF

71.1 KB Created: 2021-10-01 04:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d389b3daf31e43ab7af9b85ecbd685f9 SHA-1: cecd5288bae5d430eadb81a56e6a15c8333b5190 SHA-256: 37f17d5281c02be1c2271df91681edac17749fe6c559a0932160233f811434db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm pointing to multiple compromised CMS upload storage locations and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and embedded URLs are consistent with a tactic to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://articolo17.it/siti/usr/foto/files/19513109869.pdf In PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/20061424766.pdfIn PDF document text
    • https://zhansq.cn/upload/file/43998768157.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/20910461221.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/gijijibowugiriselebimi.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/gokirixeli.pdfIn PDF document text
    • https://mkontroll.hu/File/52700748430.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613db5c29ec84---bolapopoxefaziw.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/51828068303.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/67019916532.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/tqsjce0n3rbj88vldvm9pfn9q5/34593147624.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109240641546013.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/84892613135.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/18108320075.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/bubatebatewamekaxaduri.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/95553821451.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/17416402249.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb3bb4882d---16593937420.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109211253027868.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/7925151031.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/21614682801.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/gokodide.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335c860e4cb---defekorajiladidopi.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/56862995903.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/34821645123.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=penguin+emoji+androidPDF 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_off0000b35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB35C 17104 bytes
SHA-256: acfec4cf6653881e3ca0472b2db94c920cbcd1d1827fc8f58b7af55684eb7b98
font_01_sfnt_off0000df2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF744 10512 bytes
SHA-256: 63c8b943015ac61a6accb8095d0bb81c31e8da4ffba854e70fddbfaa33ed739e