Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fdc07e624edc5cc…

MALICIOUS

PDF

98.5 KB Created: 2021-07-16 10:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9b6b455173a8e0c9febf018eb7f30736 SHA-1: 5a6546437f3b9dc71ea01722a897f0745c93d0ed SHA-256: 1fdc07e624edc5cce96ad177e7c438d78355eb27f6fdf7f6ed8b3c1fc5838bd4
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm used for SEO manipulation or to host phishing content. The presence of these links and the overall detection indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/k1huf42rm8c11t26c8n7i0t1aj/83452714522.pdf In PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/c1i3uq64imcd9rn1uraa3aobjf/kigiwuzezuxosafulezup.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/3ulma5osmcfrqrn8oacdqukgbf/manatopudigejojafitezot.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/7443858717.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/eae8c6eecd2902e066f1be505e00d0e5/55648684737.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/wawid.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/00eb8rov01hoatnsdmci4fdkcp/77472247240.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/nurejuvegedimipoled.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/87398475113.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/8950897102.pdfIn PDF document text
    • https://actor-conseil.com/files/file/pebufutavalikosogexoti.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609436d7dd5b7---92993481511.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/52903533914.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/97168576107.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/0ecedce41835de1155bb77623cb8ffb7/kagosikutumenoveloxulibu.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b57b4ca0ce---vowokipok.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/zepetedalunoburezud.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/47634924132.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cb66cdd42---75261418369.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820580505b1---rofolutajitidosanajegob.pdfIn PDF document text
    • https://alutat.com/data/file/59830613068.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d2623d701---68162792037.pdfIn PDF document text
    • http://haki.vn/uploads/files/95098296713.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf43ceec8---83983915153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=cost+of+acquisition+in+case+of+inherited+propertyPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntIn 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_off0001263d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263D 11060 bytes
SHA-256: 2ca6a6ccba7221d5d5c7f602f05ef1c5b96aaec070a576307a0e52991162d84d
font_01_sfnt_off00013fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000157e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157E6 16604 bytes
SHA-256: 4a3ace1409ebffb3e9344d743bee820e56f4b9d3353706c310affd6cfa3c2fbb

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