Malicious PDF — malware analysis report

Static analysis result for SHA-256 015f415de78899c7…

MALICIOUS

PDF

68.0 KB Created: 2021-09-28 09:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7fe5af58f05718b7478d46f0d42a01e0 SHA-1: 0fbab7965183c9e56c6e029b79c0ce944e10fdea SHA-256: 015f415de78899c75fb997a609e502adf81c4bb65f1b27b60385e82e029052df
96 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier with high confidence. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://allytemp.ru/uplcv?utm_term=inshot+apk+free+download PDF link annotation
    • http://metisentry.net/ckfinder/userfiles/files/57533767553.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/sexovaxarivepawikagerebos.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/9250397201.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/kolabilo.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109132237599821.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/cd90fde4df4062f036dbd24295a59e5b/76602279303.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/pakojonafoloximagizif.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/kozenexepumezalapa.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/fomimibotunubu.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/0c7a5c9ec647f2d8dd226c4b16490ec1/19437562337.pdfIn PDF document text
    • http://traviet36.com/upload/files/banituwajosojuwasesumo.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/75769450766.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613197697a61a---purugumuk.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0e4b6fa76---49866463907.pdfIn PDF document text
    • http://hiniceshine.com/upload/2303795540.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/77948509168.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16152462e4564e---41313758247.pdfIn PDF document text
    • http://chenruichem.com/upload/files/62688109272.pdfIn PDF document text
    • http://sbcnepal.com/images/file/6773250717.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/25543338394.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/tumurakadino.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/vaduzu.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/wipaxazavaragomalaruzin.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_off0000aed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED1 10632 bytes
SHA-256: f8a0a59aba7472653d74205a4d229c3b120d058d2d125a8d1e05d4d3af3900cf
font_01_sfnt_off0000c727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC727 14400 bytes
SHA-256: a45fe7fde0ac0bf8b4bca121a6bcf43c3f4b7ec139d46600c9241223144aa489
font_02_sfnt_off0000eae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1