Malicious PDF — malware analysis report

Static analysis result for SHA-256 f203b99194f63ec5…

MALICIOUS

PDF

87.7 KB Created: 2021-09-06 02:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bb6f6679fc186e23e9ba28a76bc66423 SHA-1: 012376775e7c4eef2aa5dd3dbb5e64eb6089bd17 SHA-256: f203b99194f63ec559ce0782e12ed25317d8b8a24ed9c842a2d923055fc7c610
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://armenia4d.com/contents//files/zazabememosogudejixu.pdf In PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/f2be40df5bc76c927c302c5db6a65d3a/dawepebuz.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/55537806196.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/detalipebopujeza.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/pelator.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/9d8d4a10672f00e6181403ca66feffac/lisaru.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/64609682825.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/8be058950e55652888feced011d7df17/kumomesosuvajogaxoji.pdfIn PDF document text
    • https://timjanen.se/anvandarbilder/53/files/dokikitorituwijofiberutu.pdfIn PDF document text
    • https://micro-churches.net/uploads/file/3602716471.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/r9bu0sa2ten1q66o0gm2bvjcf4/xoxogegajajodupegega.pdfIn PDF document text
    • http://wrhs1976.com/clients/0/08/080801f2a31a95d446b71e9836a5425d/File/dugin.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/3309046512.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610651751bce4---24232675832.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/6pgbqe422alo6dug6h9qmg6pm6/panulebiwutekanobej.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/3ec23eb98bc39075357c9ba8aaf5437e/10249863473.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073167d4735b---8622367399.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/e0bbf82651550eb8fa8341eca1f3cdf6/78875955271.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd962e5ce2---javigigebupikajipe.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/donifoludulirefofula.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/vasazodatimipofa.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/0283cb7f843e0b75dc54c950f2750b98/zejavafokezaf.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/49489545917.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3be0aad828---35848341129.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=handout+vorlage+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_off0000efcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCD 19196 bytes
SHA-256: 6f3dbbb7ced49076ce77ba5033bdcc137fdef155e169f712652c7e0182351c2c
font_01_sfnt_off0001215d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13974 10572 bytes
SHA-256: 9950733f14c02414843a57d2d3119281be88bee69cd3235652c2df7400ea168d