Malicious PDF — malware analysis report

Static analysis result for SHA-256 a31914ceced9b717…

MALICIOUS

PDF

86.4 KB Created: 2021-09-05 02:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f7f20a6f23eb7374784d5b9414f4bc57 SHA-1: 3d56c43123ef4e9f6a1bf8a86a21886107f3641a SHA-256: a31914ceced9b717ef9f63c7502da4a51f7b66c8a2d62a2bd67756dee33d7c98
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document functions as a link farm, directing users to numerous external websites, many of which appear to be hosted on compromised WordPress installations. The ML classifier strongly indicates malicious intent, and the presence of embedded URLs suggests an attempt to redirect users to potentially harmful content or phishing sites. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://pixomot.ru/uplcv?utm_term=rows+in+excel+worksheet PDF link annotation
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a6394ac50f9---madojozujirafesukupaza.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/80ce4befcf38cb6f050a43f58a6d7b4a/jajizip.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/giloliputusajotipar.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/hhj0fk197h43s1p1113pq05n46/jufakusurugas.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/kodobujusinumi.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080660580424---80148492227.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/rawibonejopevufik.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d30b3d34985---98180036675.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/lenozabesifovikematu.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f27cfa27842---55968136385.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/7eb09630d976fad0007504e38b9ab98e/zafizuwa.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793da1a7da7---popip.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbfd561da0---dofovelitirozularureza.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/wedoreriro.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac01fa93b50---tabulexorasoluzugodumoge.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/4cd259d4373d1a86f5742fc58c98c260/74545444707.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/zurofo.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/dupevezubekin.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/pagisifabuwagapuluz.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/22111819039.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160758175da147---13491249194.pdfIn PDF document text
    • https://tappowine.com/file/ladizemadadu.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/47085102153.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/dopizezexizivo.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160adaa5a7faa7---zedewi.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_off0000f171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF171 10492 bytes
SHA-256: ca7e71869c8b680eedc61ec1cf15fafa6b61a44bcda971f0beeb87dc2152b871
font_01_sfnt_off0001094d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094D 16284 bytes
SHA-256: bb96beed70268c1c7de5856982aa0a6b92c570cf3163d62646099c7fb2124bd7
font_02_sfnt_off00013396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13396 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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