Malicious PDF — malware analysis report

Static analysis result for SHA-256 e516526db7f22e11…

MALICIOUS

PDF

73.0 KB Created: 2021-07-03 18:27:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f982c3c0d9c7faca239ce820d30498b5 SHA-1: 467ad29d0c852dd2a58f22432d31a2c8ba3c3ef8 SHA-256: e516526db7f22e113ffcb554ec055c28cdc47a881b4ecb0b5ef67c64dc4eabdf
96 Risk Score

Malware Insights

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

The PDF contains a link farm, with multiple URLs pointing to compromised CMS upload directories. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to lure users to external sites, likely for further exploitation or phishing. No scripts were extracted, but the PDF structure and embedded URLs are sufficient indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c97a6b59d18---kewufojinamibojipujaleraz.pdf In PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/72276c5c06e2a8593edb944e325d17f3/tufaxojozikogi.pdfIn PDF document text
    • http://hkalc.com/userfiles/mizutak.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/rpqun7cih4ca1o8rnisltro5hn/tuvegidesukekedelulodob.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/49500063415.pdfIn PDF document text
    • https://ivaco.it/file/93094817210.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1e95292f1---tanelipesek.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/dc72ad65d5154889912dfde55a41b575/99819344072.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/58251435264.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/68680317386.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1f4cca5f1---18759279506.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/oj5i5he0qm8mpp5vfsrqo9sokl/fojobejelowixiraxirofax.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075c2a63db58---gilugisebaxidin.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a7bc0a1b5---duliruboriluzebo.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/f5c5f0e58b457b8c098fb9f47ebff2c3/59293920708.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/c95049d34aafd697e7f61c594c5fe086/35993134906.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/namenifafixa.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/pikuxo.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/680e426f8dd6b6520f11fd3480f47269/60505458989.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160922133be652---15634172402.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/10349553787.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=in+a+spin+laundrettePDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/14330566033.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_off0000b86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB86B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD082 10316 bytes
SHA-256: 6cbea27e76a6c8ed4d0b3ca6091baa07c76915b5ec392e10af26f66892bb0485
font_02_sfnt_off0000e7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D3 17508 bytes
SHA-256: dbe1ce2782a0c7b93e89f50527502f5a292dcc48f42036fba57420e345f38e08

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