Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5896a06408b31d…

MALICIOUS

PDF

72.2 KB Created: 2021-09-08 07:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 863283b8ee61128fd6b0ea92022ab8ff SHA-1: 7a230f9e2d61328f198ec20031699f29549c96d5 SHA-256: 7b5896a06408b31d0e95e016100ec37042587b3c476081ca3db549ff9f5aafad
96 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to other PDF files hosted on compromised websites, identified 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 embedded URLs suggest a tactic of using link farms to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/l6j9lih0dinsu1a5s3stqdee00/zobob.pdf In PDF document text
    • http://foto-klub.dk/userfiles/file/55739668689.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce59323b31---42371733553.pdfIn PDF document text
    • http://plncse.hu/php_data/file/jowovarasesapako.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a372c566b---84593266602.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/wekuduwojopomimafavurebo.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b7b5d62183---84320205426.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/mirofexajinevub.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/zitufagigaboferid.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/muxorigikenu.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/645fe4774359014329ef0cda3cb7c50d/66187513709.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c17a535e152---73986598649.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/a2b8dda6d8e5c9940b9a5d10f053f33e/96216383162.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/foludumemirujigubivugoz.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/97615271103.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/c2f9ed1bf770e2254c1a53359f53777c/79262801673.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/6016499622.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/jemudumekajifixezetesume.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/61582490269.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/zajowoj.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/58613996288.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/bezojadebowowejo.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/1377585104.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edb920ade1---rofozewigowetovoxame.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea65906c49---17418005647.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=termination+of+contract+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_off0000bedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEDB 14684 bytes
SHA-256: b7b1f252cf40eac02d014c97ae6319d211d5b6ceac7fa64c9b4468214680092e
font_01_sfnt_off0000e35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35F 10528 bytes
SHA-256: 2e7057dfa4b69c63fb2e5370ffaa6c174bc7f1072eaf0b0ec785b86a263a72d5
font_02_sfnt_off0000fb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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