Malicious PDF — malware analysis report

Static analysis result for SHA-256 edbef609a1c607fd…

MALICIOUS

PDF

79.7 KB Created: 2021-09-04 14:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: fcd346ed13282b4fa1e74901ccce1539 SHA-1: 53373fafcde7c01635b345aa664cbe8bb17cfc83 SHA-256: edbef609a1c607fd628dfc010b21c3e01f56d29f2a8ce0a1420a8a08655f2a06
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.binghan.my/userfiles/file/88416271624.pdf In PDF document text
    • http://kapli74.ru/upload_picture/morutaf.pdfIn PDF document text
    • http://passionsavannah.com/clients/0/0a/0a61c075fa1d7d91f8ce2ef588f7e9ce/File/87271784767.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/4758595022.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a792f1744b---sofav.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/judikifilobosapegedafija.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/jemusawigipesamob.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/ffaf9226c1a5d1789ad81beaae7b19c5/fuvusuvafanezojuxise.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc9fa594dc---wimutudokipudiwit.pdfIn PDF document text
    • http://isleo.com/i_photos/file/82977652630.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/zesugoxofufamofulibisex.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6b689d98c4---zasizisaxasapurez.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc7b541708---maronururewu.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c50aa06b44---52974570223.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/18030743180.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/julof.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/xinirevogu.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/fusapomixamitexerisorixu.pdfIn PDF document text
    • http://shriramashramssschool.org/userfiles/file/kotinugidaviba.pdfIn PDF document text
    • https://ever-progress.com/upload/files/sunazuwanejiv.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/28203847150.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/fufoxekogakebawes.pdfIn PDF document text
    • https://harom.ro/files/file/18874251849.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfefb1f0d7---98682539199.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=creative+writing+worksheets+for+class+3PDF 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_off0000d17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17C 17456 bytes
SHA-256: 994e8dcdecec44779436f12908ca85471774ba646d231f3b8c2ae9ca56bb8d47
font_01_sfnt_off0000fee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE8 11064 bytes
SHA-256: 34ea3618f45d789b2bef8f446c71f2395344be975894a32a86f25198d14848d6
font_02_sfnt_off000118c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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