Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7f87ea4e19b6dd8…

MALICIOUS

PDF

77.1 KB Created: 2021-08-15 23:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5f0ad390d10c6bdf7322c5a9e04a1187 SHA-1: adb7edd5c0a5933200f162de70c021164d02dfd4 SHA-256: c7f87ea4e19b6dd8223c8f93c89ccced3bb636a938fbb7b27011b92708eb05c0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML score. It contains numerous links, many pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a572ad3c1ff---ferakakuzetakorub.pdf In PDF document text
    • http://maslag.eu/userfiles/file/badefibawetezefitufasev.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/vejemotemodataxage.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/nawuwodulozigefivig.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/01eda9750a5a6d23e4cb2e02be111795/gisativojatosubazef.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160819d7556cb5---mogaf.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/mhkopf2mpv4htfr2souiab7rs3/66603425588.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/lemabefizigoforalokilifa.pdfIn PDF document text
    • https://capecoralliving.com/media/file/botuditadezirujimejodatu.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/lig160i3r48rm0lnnp0chorgej/bugaxitugu.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/devafufinubivosokosed.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/34f8735b599f839f6c058da650fecb0a/sefowojusa.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/wabokuxokiw.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/5336904000.pdfIn PDF document text
    • http://odumakus.com/uploads/files/67175363492.pdfIn PDF document text
    • http://duhochmis.com/files/uploaded/files/66778322209.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/61873520747.pdfIn PDF document text
    • http://schmetterlingsgaerten.de/file/68751215099.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/7aaa02dcvvfmck6096vrgpebod/59340919560.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607fae706bb40---fuvebalajubijasu.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e90c2e87c---35319741185.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/jugabefunozopoxudijep.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/mezutusasaberivus.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088300cc73fb---20398075906.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/5c72d8f75fd036b203cedd08109744c0/kutuwodijejavumugituwetuf.pdfIn PDF document text
    • http://gewald.ru/content/Files/maparapipol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=lubrification+pot+de+suspension+2cvPDF 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_off0000c724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC724 17404 bytes
SHA-256: eded61512a3d8570760d16a8113ec9a6cbcb297be0fc80e0e1ea2296cdba435c
font_01_sfnt_off0000f361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF361 10948 bytes
SHA-256: 632c90728612f19adaf0f3d733ea3c8539aa1d428c3ae7dcd8752aed10b8ecc0
font_02_sfnt_off00010cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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