Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbda342da962c5c1…

MALICIOUS

PDF

88.2 KB Created: 2021-08-10 11:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b7f6c78a1adc89e917542a8e7048e771 SHA-1: ede1d24e7c0c1472fb74c42fbd00817f12bed44f SHA-256: bbda342da962c5c1e378aad4421b327bf0b03cf0b9c5c926092081423b1e8465
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and URL patterns suggest an attempt to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://crewmak.ru/uplcv?utm_term=computer+assisted+learning+pdf PDF link annotation
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/8758a0d639eb2a3ea0d7a1a666a003de/79258647318.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/vixirajugeveb.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/9e989af80fd0fac60f51aa3942219d8c/25873444673.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/bkq9o3pvm01319f03slao007do/65761825358.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bcb550897---43153732961.pdfIn PDF document text
    • http://uniqueaddress.in/crm/files/zofigulasepum.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e8d42fcfdd4---39955729543.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/70058383716.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/lotajagi.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/jokegopewibizor.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/nedoj.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/bomubewuwefavu.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4039c38017---xasivesupubedajel.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc5af01356---sudipatupedatorerenu.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/96519817223.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/6d25c6f61433681791d42a25be9fac5e/64954249044.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085e6454f2f7---revibatob.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/5f147a67851dc66d801f9a2a90ea5c15/gobefitaledopoxigikavolu.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/benunurukozi.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/22965707514.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079af037a697---63219071609.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/a6c95dc885729edf1b6c6cd5892bcff3/51286054023.pdfIn PDF document text
    • http://yuqiaohome.com/uploads//files/202108020255389742.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/joletimukojexukurik.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/93136490832.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/f667eeab648e2a87b6aae9b4c48c4546/nuxeverukalosano.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/jegokunavom.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_off0000f54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D66 10972 bytes
SHA-256: d092ff45bd79929af9077edcae3ccb643469be7d4b0e78ecad1ef55c764fe133
font_02_sfnt_off0001269e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269E 17076 bytes
SHA-256: 66ded78effc2ce3b744149b275997c970156c635e81692825c4aeeb350eeb1e5