Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a15c312c3ab800…

MALICIOUS

PDF

94.7 KB Created: 2021-07-20 10:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a50a23b1e5c1be59deadbd8e4776ce0b SHA-1: 896bd35e8e67b18044c3c316146776634ca4c480 SHA-256: 87a15c312c3ab800fe1a2e74db38e187a756cc6db77b08ebb1b1fa7457b01be5
96 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many pointing to compromised WordPress sites, which are likely intended to lure users into downloading further malicious content. The ML classifier strongly indicates maliciousness, and the heuristic firings confirm the presence of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e264037d8---89616883848.pdf In PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/42df162f45e2cd8e723fbc66998b9430/32355902873.pdfIn PDF document text
    • http://sakem.org/userfiles/files/71466701652.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/5bf875f622693835ff388d78cda841ab/57307563323.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c144446eb93---muxilexifuledosadikif.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160dcd5e8c505d---34296881781.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/qlbra5icdf9s2lk5tasffavk0q/53894974989.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/vr178sb14eu09bkhc3du06bic5/508183222.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/826492eb66c1604464b8274df1e116ea/birazunabusuzakidawanisu.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210606121651.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/6c59249906eedb4c1d1443a1e8ebb9e5/lefiferekojepikugeju.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/l0u9ni43lv92h0sfbjjfh6e1sg/19284507314.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/19782424132.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7401ba8733---vezikagujibidodujiki.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/0d2f3e2b20f7d193fea27e94e8d0c0df/88781118536.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/fisafugixu.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/mutakafiwi.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/3e7c2fb2f663997488901bc81b1ee472/gosiwuvomelasoriwapixo.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/lomukugejopevudefum.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/tebudesel.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160f0b7d0080b0---52719315164.pdfIn PDF document text
    • https://clubsportedinburgh.org/userfiles/files/kuzumuwimupinupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=on+follow+up+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE759 16800 bytes
SHA-256: cd03deab76db72ecf680644dbe26bce713b0b4f333ace4bc8aac18de16aeb314
font_01_sfnt_off0000ff5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5F 18780 bytes
SHA-256: a6fd614bdfd803facabfc8d7d9c43d27f8f73695e16328f2daa6fa39a2b5839e
font_02_sfnt_off00013038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13038 10544 bytes
SHA-256: 8752008ee41b4f8593f453489fd6d4536ae2d121fbf1a56716f36637539f78e5
font_03_sfnt_off0001483a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1483A 3072 bytes
SHA-256: 6584edade1ca42a382b3e262707a2ccd3b866d82eec780ae82c6fe83d6f73bbd
font_04_sfnt_off0001549b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1549B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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