Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80b72bc3f912bc7…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 19:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 193a4226695c05e31addf1742eb10643 SHA-1: c50e7a02afe01095ded1799d1abe8a42555dda61 SHA-256: a80b72bc3f912bc7b883dd3ce0d01486118356e7613a1edcdb89b91537529630
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm with numerous URLs pointing to compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier also flagged this PDF as malicious with high confidence. The presence of these links suggests the document is intended to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 5

  • 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 http://dnt-mayak.ru/content/File/jomewilapepojotanakezud.pdf In PDF document text
    • https://karapinler.com/calisma2/files/uploads/66877684126.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/78743574449.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/81618377165.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/6176966982.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/634ca998254f06d7aa4986d2613e4f85/luxatokasaka.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/97325875199.pdfIn PDF document text
    • http://wmasgroup.com/userfiles/file/463975920.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/31577810499.pdfIn PDF document text
    • https://curvy.tw/upload/files/15381752780.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be00e698c6---50608769076.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/xodapadisozepuruv.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///wokikilazoke.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210906042232.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/13250695603.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/75608106854.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/napakokenekobu.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/pulikazoledadipotufikut.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/81673290347.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/legadosipomexefikedejodef.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/gojajumavinikalipezijut.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/4686071189.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/b1f38c59e735342cd9e5252d875b5c1d/33727759258.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/duvilinegikujuza.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2047dd1fef914692c7125149cf850478/52290225721.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/99577565422.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f83f2956f2---99989492691.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=office+365+scan+to+email+smtp+settingsPDF 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_off0000d6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDA 17156 bytes
SHA-256: 88ce3eeb7836488ab069b0f4f1f603c2053e8802b62dfbedc6638bf9c0c5debd
font_02_sfnt_off00011bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBA 11220 bytes
SHA-256: 90045837173c191483c92f946b99bff6cc1cd5d53f670431893c408c7f0f7c7e

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