Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81ed3c6e2644759…

MALICIOUS

PDF

68.3 KB Created: 2021-10-04 00:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ba49222e6a5e9c1d67b19fdf9fe3f273 SHA-1: e35a90c06a20926ebfa17ea08a1cac777bf16fa1 SHA-256: f81ed3c6e26447595427221edc8450e3a7c8ccb05f0eb518c92857bbc6ae074b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is part of a campaign to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aumnat2car.com/ckfinder/core/connector/php/upload/files/65990574025.pdf In PDF document text
    • https://deltaguvenlik.net/userfiles/file/xedevofuzulubidiziletutop.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/watajolekaxabesukotugix.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7e1d98d1e---79439571132.pdfIn PDF document text
    • http://gptools.net/userfiles/file/lorapiv.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/63925560020.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109110814126769.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140cf6b3b400---fosiwabosenugiv.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615123721c038---97955795418.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/debinusupazinat.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/50867640167.pdfIn PDF document text
    • http://zenithmetals.com/files/94737561089.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/kimelebalakixo.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/nipatoruwewitegazuxupeb.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c1b9b4741c---18394316720.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/39861421813.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/95947226748.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/46462556370.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/wenigigubika.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210904073016.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/48173927629.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/61778363396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=harry+potter+and+the+deathly+hallow+part+1PDF 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_off0000ae67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE67 15016 bytes
SHA-256: 3e7ecbfa65c25a1ca3c5f9e1a4e21e99d8ef688ecdb14c418c26c7ddbfb8d970
font_01_sfnt_off0000d408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD408 10472 bytes
SHA-256: 23ebd9522682651d9749e334b3ce71c71e2aca3700ebd4440ae13d3f44f15e37
font_02_sfnt_off0000ebcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.