Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ed4f75fbd4110e…

MALICIOUS

PDF

78.1 KB Created: 2021-09-07 07:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b48bc78c4c400b89f103f9272b0bf359 SHA-1: 7081215f884720646337cd7102d0cb1c05a795ca SHA-256: 51ed4f75fbd4110e62bc17c0c91ca0c205584589344d4d39c48517c8d670286d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains phishing content. It functions as a link farm, containing numerous external URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://infrive.ru/uplcv?utm_term=axial+flow+turbines+pdf PDF link annotation
    • http://wingmanresearch.com/userfiles/files/98965424964.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/26805623930.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/lilitizibuti.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/nawiminegurexodoparoj.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/kupuninajulasox.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/deeef58df4e4db44bdba7a45a4158aec/kuvugubadipatapabibubuf.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/70618739948.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/404bff29dee52ebefebe1eef57689ed4/12099492285.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b63007c3182---37938783160.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/mudibareger.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c70634670b0---jorixape.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609e66f786836---kejuveminosabupuxetis.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/68381771230.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/39959926570.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/vsq2i742j6ankep9pt4v4s2e64/tamewopatobakex.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b0b638474.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/63905637279.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7539519620---fuxuzu.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/5ec05cdc4c9b5bacf356bf89cadf2e88/vibolaxezofobofu.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/163630729a1ae7950b5d7e0671def686/topoxixaforem.pdfIn PDF document text
    • https://defi128.com/userfiles/files/vujigobok.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/ronog.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/8e6612fec4e1c43744d5adcae4468f6f/kisoparo.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16082117f0b5a5---35022025301.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/f9bdb923e332d98e751262b063e2c895/vojelejerowobofawowogujej.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210805_12B23D3C615074DA.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_off0000cb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB06 10900 bytes
SHA-256: 9bb03b2ed1838efe48422bd2cf129512fa37a9c8e9353d66107e4a751619102f
font_01_sfnt_off0000e43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4E 18112 bytes
SHA-256: 5735c9b5ffac8c2257f7eb27f82c3dcf8f121aae1ce2812d577f950b0e0169c6

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