Malicious PDF — malware analysis report

Static analysis result for SHA-256 fccf50dfeb321846…

MALICIOUS

PDF

69.1 KB Created: 2021-09-26 20:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 746ca66e9230e35384f9736e57139ac3 SHA-1: 1887f1c7f1da865c407886fcecb49c32e64f0385 SHA-256: fccf50dfeb3218466ddab1d096d5b84c1697330825d54625a8b33d7fee923d05
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the download or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://queure.ru/uplcv?utm_term=apk+file+download+free+fire PDF link annotation
    • https://dsverano.com/UserFiles/File/tezoro.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/nolobuvinawifid.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/vudifezekesofexib.pdfIn PDF document text
    • http://agrion.org/upload/fichier/70961777278.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/tegafabifuboruputatawap.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/51070192956.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/bipukafufikivozijik.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/60240373312.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/97242702888.pdfIn PDF document text
    • https://iwistw.com/upload/files/71953011427.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/33250447705.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614817eaefd51---79318976418.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/ad727ff246f7f0300476a0ab3c86bc8d/zedegitapos.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/8e1ff1491e3d8bae5df9b83dca2a58fd/zonifiwozujanaw.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/dunakiwijefemedajewug.pdfIn PDF document text
    • http://shesob.com/file/files/dadipetupuvizugawabujofif.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/bilobiduzotedajose.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/27dcb11963b61be6a7438a2f06fa65c9/jakifojatijani.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/161394d455d82e---ratugazogegimuvamebatos.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161350bf50431d---51486465395.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/xetuwejomobezaw.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/jutuduvadi.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_off0000b12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB12D 15112 bytes
SHA-256: d789f9294bac0574ffb899c95447dcb544df7c781c7295e86c1778c3eb0f9cd6
font_01_sfnt_off0000d70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70D 10384 bytes
SHA-256: 87cfc825272cd35d28d90a97880c8f897a4f4e9263b7e15f802198cfd30902c5
font_02_sfnt_off0000eeb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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