Malicious PDF — malware analysis report

Static analysis result for SHA-256 a630e25253deaa44…

MALICIOUS

PDF

88.8 KB Created: 2021-06-26 17:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8dc1eec88e9a754b0ee4f5cf6631a589 SHA-1: c1ba2c809b0b80f577561de2a6640192d5fd95ed SHA-256: a630e25253deaa44122c36449a88337c70d43be9c88121249b8a124c82d2c5a9
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious destinations. The ML classifier strongly indicates malicious intent, and the presence of multiple external URIs reinforces this assessment. No scripts were extracted, but the document's structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://crysiq.ru/uplcv?utm_term=red+river+criterion PDF link annotation
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160731a44e0263---59366351278.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/fss16ragf17j3liaf4anffq5mu/suzubolijalufefaviji.pdfIn PDF document text
    • http://sushi-belovo.ru/files/71736138947.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b6d5847de---34176481065.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/14c388b2f2f1980790da987d42bf9693/21323450715.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e053b8936b---xometepededopurigunu.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cba7bdb0e---tosonajedeg.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/92371051137.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e3e71d4fa---41070925036.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/61654080564.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/19069333653.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/popitolekovomiwiwiridu.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/9e511a4a699bf5cdfd16bcc772f58f89/bitumurifiwaxi.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/eb6c31c67a7a544232319937b3268c76/lanozarijaso.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/d471672fbc348e6b32c55a67dda509fe/39729794096.pdfIn PDF document text
    • http://rowanfamilyreunion.com/clients/28915/File/4015961961.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/kevugib.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/f1fa47358014ca95e931b9e34717b389/totirubotoligujifufuvil.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/116c8b63869af79045f10cfcf89c5679/pujalureza.pdfIn PDF document text
    • http://placc.info/up_image/jisasejononafabatef.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/kv1kebcupsk3takljfrelg9d5j/xijofibevosokisirowotopi.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/sqkb78j7n8d9nrf5hotnp73afk/98876864389.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/vibamit.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4a2b212d1---56600177238.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/xubimuzadopak.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a064709b60b---4005997786.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_off0000f997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF997 17448 bytes
SHA-256: 34f1e1f0a550cd520ff0f0c55cf9def6035dabf0911616a896c8001f9e9f5d11
font_01_sfnt_off00012730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12730 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F47 10100 bytes
SHA-256: 175c577b7df8537605abfbfef3e42b19738b2c3ca01aa4e1b6a42aaecaebf929