Malicious PDF — malware analysis report

Static analysis result for SHA-256 917785fd3419d328…

MALICIOUS

PDF

89.1 KB Created: 2021-09-05 00:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 91adfc094c2fb1c5012194280bc8292f SHA-1: 2921c697e3be99af6b359f84adfc1c278aaed60e SHA-256: 917785fd3419d3283e168f0ad235bcaa1c74ec638316cdd02a549a5d40ff5c34
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. Multiple heuristics indicate the presence of link farms pointing to compromised or disposable hosting, suggesting an attempt to distribute further malicious content or phish for information. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=designing+distributed+systems+pdf+brendan+burns PDF link annotation
    • https://fundreamz.com/ckfinder/userfiles/files/67804392157.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b00cce65a3d---50599588045.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/lasefizenixegafe.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/xisawulokepow.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/76343180112.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/18787895005.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210530130043791.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/mevixatudekuxenoda.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/6b3v2k8q6ga6e04h91i1lgu0h4/gukiposivoweboxovilo.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/wikogimozofuga.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b270eaee3---4543238755.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f9d5450d3ef---87022033596.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/liwolufewewapasuwalepewu.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b88b949c61---wizelebe.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e346a0da08---muxuluk.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/40789274277.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/pebusunoso.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610020fe7bd5a---42193052413.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707e8ccdfb8---7309354296.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/ccc5b40b25c1ad110fd690a8a7a7b32c/nelekotifusebufobimi.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160869759a0e86---mewajipopatawikemeb.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/59213844544.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F9 11032 bytes
SHA-256: 926d9d3cfb2b292a56c0e91bdc18c1d573a2fa6025dc40aae14152d7a1db691a
font_01_sfnt_off0001104c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001285e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285E 17784 bytes
SHA-256: 70467dc2b0a0f37706bb844fb4c69e067bbd48bce3a0a96c054d69d03e3eaee9

Open this report in the interactive analyzer, or submit your own file for analysis.