Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ff544b1fead251…

MALICIOUS

PDF

83.2 KB Created: 2021-08-15 02:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e116f23be38d39ef9b1a0f3ab8e30963 SHA-1: a91c234e09f744edd232ed581f9b252e840d0431 SHA-256: 90ff544b1fead251aeef02fa49a7bff1d2d36c4613b6b543175e2b13edb49a91
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS upload storage or disposable hosting. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a browser extension or update, a common tactic for phishing or malware delivery. The embedded JavaScript, though not fully detailed, likely facilitates the execution of malicious actions or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://pixomot.ru/uplcv?utm_term=noun+phrase+worksheet+for+grade+4 PDF link annotation
    • http://esthebel.de/userfiles/file/69423765741.pdfIn PDF document text
    • http://gestmase.com/media/images/file/luzuwurelifijuretiledegik.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/287f43505b7d12e691fb1ba1d96ebe10/deposunepilanilenop.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/linugi.pdfIn PDF document text
    • https://cargotavio.ru/files/file/77767346011.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/25379252006.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/97660596989.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/zegugesujagu.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/malowusajidozeroratabeji.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/11141229329.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/004ed38f8beef1f28bd360c856f000b3/23205733342.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/n2hmso4e79v7gukf4o767p17td/revupafu.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a0ee0749e---99803656884.pdfIn PDF document text
    • https://viettrungson.com/media//Files/soremakusejoveduzobepup.pdfIn PDF document text
    • https://bloc-immo.com/images/65005617635.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/aa896e4898dee5849113336034d4922d/lebuviwofufuwimege.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16077c9677a19e---pubonuk.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/58322769026.pdfIn PDF document text
    • https://arerp.kr/data/file///vevivexonerodej.pdfIn PDF document text
    • http://articolo17.it/siti//usr/foto/files/10597468771.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210604_E5649D6C21A81AC5.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/31bcd25d479d5becbbb776d8654ff393/riwulez.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_off0000e05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05E 17160 bytes
SHA-256: 571a4f31ec53155b9cc1951894a1b94d0c90d090cad54c3482cdb655474f64d2
font_01_sfnt_off00010d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0A 10972 bytes
SHA-256: 964453c304b6936cc0bf8ecf3678926f24b3ecae8e47db18c5689c5c0ae36a0c
font_02_sfnt_off00012665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12665 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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