Malicious PDF — malware analysis report

Static analysis result for SHA-256 9af2c06854c63591…

MALICIOUS

PDF

86.0 KB Created: 2021-09-03 20:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 424364b23ce0059bec2e592b035cbc2e SHA-1: 66459c06c3e931eb37a18e392fb5085cde8037c9 SHA-256: 9af2c06854c63591df2fcf38bb9d06e2232ee40da7308baef66250dece5cfd8d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the structure and URL patterns indicate an attempt to lure users to external resources, potentially for further exploitation or malware delivery.

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 http://www.sanruou.com/app/webroot/uploads/files/61489007243.pdf In PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/gijevubuzorej.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607a104c7cfa4---93368619681.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/zominitofonipemukisu.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a2de729c899---soxolorave.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/zakibiruda.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202108152358323419.pdfIn PDF document text
    • https://area5srl.it/file/wemivil.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6a91e0994---84237708411.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/84296015338.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/12859099929.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ecd775576---57084421755.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/41871002849.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/8204fb2082ef729c2a3e3a161360d7ad/mebesijipekuje.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/3572b13b9b6b996386b450da10ff56d4/jumijakokamonuru.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c301a26444b---71427455520.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/34771242341.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612395ef1297b---gopetobiruxexetabito.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/rmqifo0f6qgqljehjjd7jk02v6/66820845294.pdfIn PDF document text
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/nolosave.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a1990fa0c58---zanuzememusurapotez.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160773ab2c3242---29700482220.pdfIn PDF document text
    • https://mfdesign.hu/files/file/12632418399.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a1b8438f9---77170949703.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ibm+rational+doors+9.6+user+manual+pdfPDF 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_off0000e8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EC 17888 bytes
SHA-256: 4a06b569e509d0418342308f9f4f4f489036882b2b495b33caf9d1e2780c2417
font_01_sfnt_off00011797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11797 11252 bytes
SHA-256: 243e5e8f399bdb19c845484ab593cef5e0472d45c3e28fb1a814a97ee229fb2d
font_02_sfnt_off000131b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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