Malicious PDF — malware analysis report

Static analysis result for SHA-256 385452e2957cdcd8…

MALICIOUS

PDF

121.2 KB Created: 2021-07-24 13:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 04f763636d696312a1dc162b89871136 SHA-1: 02047132a1512d9a468c65afe3033b01b43cf0cc SHA-256: 385452e2957cdcd8a60a0e53d87ce409c36b95956ae269aef3822229469b4835
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO manipulation scheme. The document body is heavily obfuscated, preventing analysis of its direct content, but the overall structure and URL findings strongly suggest a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/ea6e558f84641a482ed3388693684d7f/87924431858.pdf In PDF document text
    • http://neonatal-surgery.ru/userfiles/files/30251823166.pdfIn PDF document text
    • http://soflocops.net/clients/81266/File/kajopejawukipavos.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/37300063489.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/32042885661.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/9qjscjf7fla0ral5aholkrhc00/tixaxupodevawulesigog.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/27048774653.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945b847dbea---peloboka.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/fezanigatolaxexalu.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/8416da2a2dba861d9184f9eb1253ae8c/tusaxili.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/jibixifonovodunode.pdfIn PDF document text
    • http://apnorajasthan.net/userfiles/file/21569666980.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9c3495327---43172213189.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afad950cd27---nemonarig.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1606cede51fc87---37002044542.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607086221b877---pugitakarik.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083118c439be---nozagosubevere.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/novovalobosejo.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29549a0618---nugogulumaj.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24b60e12c3---fakokozake.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+the+principle+of+the+biuret+test+for+proteinsPDF 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_off00017328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17328 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B3F 10812 bytes
SHA-256: 3d3b8d8fe45de5d9fb9d21f53b7a809031c696d549dec692002e03c3773f54a0
font_02_sfnt_off0001a3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3EB 19700 bytes
SHA-256: 12afe01f9811e7c096c88abf04009a71096e9f3018a417fe5ef9d99d67827bb1

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