Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0545570d126967d…

MALICIOUS

PDF

69.9 KB Created: 2021-09-02 16:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: de7aada95dfe4f6092d80108d27a262f SHA-1: 09b4c701746031b10be3e7169bc38aa579de503d SHA-256: a0545570d126967d8882966fb85087e4dcff9aaa107c3da5e70ebef4f26d4992
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS platforms or appear to be disposable. This pattern is commonly used to distribute phishing content or redirect users to exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://moyamoya.center/images/hand_uploaded/files/26652108315.pdf In PDF document text
    • https://zapcdn.space/web/img/podborky/files/xofarovagubilubuvozomuj.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/62753292874.pdfIn PDF document text
    • http://orthopediedelft.eu/files/73687904569.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160743f5661fd6---tozegusajeruwidutuja.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/56503501375.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c93a0924c0---gobotej.pdfIn PDF document text
    • http://manajrgvaaradhi.com/cms-uploads/files/sepokizuxifi.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/90384574382.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/borekirasilazutuw.pdfIn PDF document text
    • https://jcpcdesign.com/upload/ckfinder_temp/files/20210704153001.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/cf3f718780e4bbe213cd8118b69e9e5f/kanovonejezelopixemo.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58618a6b1e---vixevilelofi.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/30059634581.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/fubogod.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/gigubafakidu.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/rorudimedojevigitavazupi.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/nugagitosegokubetirune.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb137e0761---52725651165.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/goliloru.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/bagadodugasilini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=conduct+disorder+interventions+pdfPDF 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_off0000b0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DF 15560 bytes
SHA-256: 07856799e46b01ca825b95205c9cd63777f0c4ffcc85bb9725124297d61f51fa
font_01_sfnt_off0000d81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81F 10604 bytes
SHA-256: 4a20624b7a9f4870926fdc8056311bc6ff73c89e90c399a63d8663368739f0f1
font_02_sfnt_off0000f089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF089 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1